Enable or disable macros in Office documents

This article is about macro security and explains the risks of enabling macros and how the Trust Center in the 2007 Microsoft Office system can help to mitigate these risks.

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What is a macro and what is the security risk?

Macros automate frequently-used tasks; many are created with VBA (Visual Basic for Applications (VBA): A macro-language version of Microsoft Visual Basic that is used to program Microsoft Windows-based applications and is included with several Microsoft programs.) and are written by software developers. However, some macros pose a potential security risk. A person with malicious intent can introduce a destructive macro, in a document or file, which can spread a virus (virus: A computer program or macro that "infects" computer files by inserting copies of itself into those files. When the infected file is loaded into memory, the virus can infect other files. Viruses often have harmful side effects.) on your computer.

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Enable or disable macros with the Trust Center

Macro security settings are located in the Trust Center. However, if you work in an organization, your system administrator might have changed the default settings to prevent anyone from changing any settings.

 Note   When you change your macro settings in the Trust Center, they are changed only for the Office program that you are currently using. The macro settings are not changed for all your Office programs.

Which program are you using?


Access

  1. Click the Microsoft Office Button Button image, and then click Access Options.
  2. Click Trust Center, click Trust Center Settings, and then click Macro Settings.
  3. Click the options that you want:
    • Disable all macros without notification Click this option if you don't trust macros. All macros in documents and security alerts about macros are disabled. If there are documents with unsigned macros that you do trust, you can put those documents into a trusted location. Documents in trusted locations are allowed to run without being checked by the Trust Center security system.
    • Disable all macros with notification This is the default setting. Click this option if you want macros to be disabled, but you want to get security alerts if there are macros present. This way, you can choose when to enable those macros on a case by case basis.
    • Disable all macros except digitally signed macros This setting is the same as the Disable all macros with notification option, except that if the macro is digitally signed by a trusted publisher, the macro can run if you have already trusted the publisher. If you have not trusted the publisher, you are notified. That way, you can choose to enable those signed macros or trust the publisher. All unsigned macros are disabled without notification.
    • Enable all macros (not recommended, potentially dangerous code can run) Click this option to allow all macros to run. This setting makes your computer vulnerable to potentially malicious code and is not recommended.

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Excel

  1. Click the Microsoft Office Button Button image, and then click Excel Options.
  2. Click Trust Center, click Trust Center Settings, and then click Macro Settings.
  3. Click the options that you want:
    • Disable all macros without notification Click this option if you don't trust macros. All macros in documents and security alerts about macros are disabled. If there are documents with unsigned macros that you do trust, you can put those documents into a trusted location. Documents in trusted locations are allowed to run without being checked by the Trust Center security system.
    • Disable all macros with notification This is the default setting. Click this option if you want macros to be disabled, but you want to get security alerts if there are macros present. This way, you can choose when to enable those macros on a case by case basis.
    • Disable all macros except digitally signed macros This setting is the same as the Disable all macros with notification option, except that if the macro is digitally signed by a trusted publisher, the macro can run if you have already trusted the publisher. If you have not trusted the publisher, you are notified. That way, you can choose to enable those signed macros or trust the publisher. All unsigned macros are disabled without notification.
    • Enable all macros (not recommended, potentially dangerous code can run) Click this option to allow all macros to run. This setting makes your computer vulnerable to potentially malicious code and is not recommended.
    • Trust access to the VBA project object model    This setting is for developers and is used to deliberately lock out or allow programmatic access to the VBA object model from any Automation client. In other words, it provides a security option for code that is written to automate an Office program and programmatically manipulate the Microsoft Visual Basic for Applications (VBA) environment and object model. This is a per user and per application setting, and denies access by default. This security option makes it more difficult for unauthorized programs to build "self-replicating" code that can harm end-user systems. For any Automation client to be able to access the VBA object model programmatically, the user running the code must explicitly grant access. To turn on access, select the check box.

 Tip   You can open the macro security settings dialog box from the Developer tab in the Ribbon, which is part of the Microsoft Office Fluent user interface. If the Developer tab is not available, click the Microsoft Office ButtonButton image, and then click Excel Options. Click Popular, and then select the Show Developer tab in the Ribbon check box.

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Outlook

  1. On the Tools menu, click Trust Center.
  2. Click Macro Settings.
  3. Click the options that you want:
    • No warnings and disable all macros Click this option if you don't trust macros. All macros and security alerts about macros are disabled.
    • Warnings for signed macros; all unsigned macros are disabled This is the default setting and is the same as the Disable all macros with notification option, except that if the macro is digitally signed by a trusted publisher, the macro can run if you have already trusted the publisher. If you have not trusted the publisher, you are notified. That way, you can choose to enable those signed macros or trust the publisher. All unsigned macros are disabled without notification.
    • Warnings for all macros Click this option if you want macros to be disabled, but you want to get security alerts if there are macros present. This way, you can choose when to enable those macros on a case by case basis.
    • No security check for macros (Not recommended) Click this option to allow all macros to run. This setting makes your computer vulnerable to potentially malicious code and is not recommended.

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PowerPoint

  1. Click the Microsoft Office Button Button image, and then click PowerPoint Options.
  2. Click Trust Center, click Trust Center Settings, and then click Macro Settings.
  3. Click the options that you want:
    • Disable all macros without notification Click this option if you don't trust macros. All macros in documents and security alerts about macros are disabled. If there are documents with unsigned macros that you do trust, you can put those documents into a trusted location. Documents in trusted locations are allowed to run without being checked by the Trust Center security system.
    • Disable all macros with notification This is the default setting. Click this option if you want macros to be disabled, but you want to get security alerts if there are macros present. This way, you can choose when to enable those macros on a case by case basis.
    • Disable all macros except digitally signed macros This setting is the same as the Disable all macros with notification option, except that if the macro is digitally signed by a trusted publisher, the macro can run if you have already trusted the publisher. If you have not trusted the publisher, you are notified. That way, you can choose to enable those signed macros or trust the publisher. All unsigned macros are disabled without notification.
    • Enable all macros (not recommended, potentially dangerous code can run) Click this option to allow all macros to run. This setting makes your computer vulnerable to potentially malicious code and is not recommended.
    • Trust access to the VBA project object model    This setting is for developers and is used to deliberately lock out or allow programmatic access to the VBA object model from any Automation client. In other words, it provides a security option for code that is written to automate an Office program and programmatically manipulate the Microsoft Visual Basic for Applications (VBA) environment and object model. This is a per user and per application setting, and denies access by default. This security option makes it more difficult for unauthorized programs to build "self-replicating" code that can harm end-user systems. For any Automation client to be able to access the VBA object model programmatically, the user running the code must explicitly grant access. To turn on access, select the check box.

 Tip   You can open the macro security settings dialog box from the Developer tab in the Ribbon, which is part of the Microsoft Office Fluent user interface. If the Developer tab is not available, click the Microsoft Office ButtonButton image, and then click PowerPoint Options. Click Popular, and then select the Show Developer tab in the Ribbon check box.

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Publisher

  1. On the Tools menu, click Trust Center.
  2. Click Macro Settings.
  3. Click the options that you want:
    • Disable all macros without notification Click this option if you don't trust macros. All macros in documents and security alerts about macros are disabled. If there are documents with unsigned macros that you do trust, you can put those documents into a trusted location. Documents in trusted locations are allowed to run without being checked by the Trust Center security system.
    • Disable all macros with notification This is the default setting. Click this option if you want macros to be disabled, but you want to get security alerts if there are macros present. This way, you can choose when to enable those macros on a case by case basis.
    • Disable all macros except digitally signed macros This setting is the same as the Disable all macros with notification option, except that if the macro is digitally signed by a trusted publisher, the macro can run if you have already trusted the publisher. If you have not trusted the publisher, you are notified. That way, you can choose to enable those signed macros or trust the publisher. All unsigned macros are disabled without notification.
    • Enable all macros (not recommended, potentially dangerous code can run) Click this option to allow all macros to run. This setting makes your computer vulnerable to potentially malicious code and is not recommended.
    • Trust access to the VBA project object model    This setting is for developers and is used to deliberately lock out or allow programmatic access to the VBA object model from any Automation client. In other words, it provides a security option for code that is written to automate an Office program and programmatically manipulate the Microsoft Visual Basic for Applications (VBA) environment and object model. This is a per user and per application setting, and denies access by default. This security option makes it more difficult for unauthorized programs to build "self-replicating" code that can harm end-user systems. For any Automation client to be able to access the VBA object model programmatically, the user running the code must explicitly grant access. To turn on access, select the check box.

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Visio

  1. On the Tools menu, click Trust Center.
  2. Click Macro Settings.
  3. Click the options that you want:
    • Disable all macros without notification Click this option if you don't trust macros. All macros in documents and security alerts about macros are disabled. If there are documents with unsigned macros that you do trust, you can put those documents into a trusted location. Documents in trusted locations are allowed to run without being checked by the Trust Center security system.
    • Disable all macros with notification This is the default setting. Click this option if you want macros to be disabled, but you want to get security alerts if there are macros present. This way, you can choose when to enable those macros on a case by case basis.
    • Disable all macros except digitally signed macros This setting is the same as the Disable all macros with notification option, except that if the macro is digitally signed by a trusted publisher, the macro can run if you have already trusted the publisher. If you have not trusted the publisher, you are notified. That way, you can choose to enable those signed macros or trust the publisher. All unsigned macros are disabled without notification.
    • Enable all macros (not recommended, potentially dangerous code can run) Click this option to allow all macros to run. This setting makes your computer vulnerable to potentially malicious code and is not recommended.
    • Trust access to the VBA project object model    This setting is for developers and is used to deliberately lock out or allow programmatic access to the VBA object model from any Automation client. In other words, it provides a security option for code that is written to automate an Office program and programmatically manipulate the Microsoft Visual Basic for Applications (VBA) environment and object model. This is a per user and per application setting, and denies access by default. This security option makes it more difficult for unauthorized programs to build "self-replicating" code that can harm end-user systems. For any Automation client to be able to access the VBA object model programmatically, the user running the code must explicitly grant access. To turn on access, select the check box.

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Word

  1. Click the Microsoft Office Button Button image, and then click Word Options.
  2. Click Trust Center, click Trust Center Settings, and then click Macro Settings.
  3. Click the options that you want:
    • Disable all macros without notification Click this option if you don't trust macros. All macros in documents and security alerts about macros are disabled. If there are documents with unsigned macros that you do trust, you can put those documents into a trusted location. Documents in trusted locations are allowed to run without being checked by the Trust Center security system.
    • Disable all macros with notification This is the default setting. Click this option if you want macros to be disabled, but you want to get security alerts if there are macros present. This way, you can choose when to enable those macros on a case by case basis.
    • Disable all macros except digitally signed macros This setting is the same as the Disable all macros with notification option, except that if the macro is digitally signed by a trusted publisher, the macro can run if you have already trusted the publisher. If you have not trusted the publisher, you are notified. That way, you can choose to enable those signed macros or trust the publisher. All unsigned macros are disabled without notification.
    • Enable all macros (not recommended, potentially dangerous code can run) Click this option to allow all macros to run. This setting makes your computer vulnerable to potentially malicious code and is not recommended.
    • Trust access to the VBA project object model    This setting is for developers and is used to deliberately lock out or allow programmatic access to the VBA object model from any Automation client. In other words, it provides a security option for code that is written to automate an Office program and programmatically manipulate the Microsoft Visual Basic for Applications (VBA) environment and object model. This is a per user and per application setting, and denies access by default. This security option makes it more difficult for unauthorized programs to build "self-replicating" code that can harm end-user systems. For any Automation client to be able to access the VBA object model programmatically, the user running the code must explicitly grant access. To turn on access, select the check box.

 Tip   You can open the macro security settings dialog box from the Developer tab in the Ribbon, which is part of the Microsoft Office Fluent user interface. If the Developer tab is not available, click the Microsoft Office ButtonButton image, and then click Word Options. Click Popular, and then select the Show Developer tab in the Ribbon check box.

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How can the Trust Center help protect me from unsafe macros?

Before enabling a macro in a document, the Trust Center checks for the following information:

If the Trust Center detects a problem with any of these, the macro is disabled by default, and the Message Bar appears to notify you of a potentially unsafe macro.

Document Action Bar

To enable the macro click Options on the Message Bar, a security dialog box opens. See the next section for information about making decisions about macros and security.

 Note   In Microsoft Office Outlook 2007 and Microsoft Office Publisher 2007, security alerts appear in dialog boxes, not in the Message Bar.

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A security warning asks if I want to enable or disable a macro. What should I do?

When the Securty Options dialog appears, you can enable the macro or leave it disabled. You should enable the macro if you are sure it is from a trustworthy source.

Microsoft Office Security Options

 Important   If you are sure the document and macro are from a trustworthy source and have a valid signature, and you do not want to be notified about them again, instead of changing the default Trust Center settings to a less safe macro security setting, you can click Trust all documents from this publisher in the security dialog box. This adds the publisher to your Trusted Publishers list in the Trust Center. All software from that publisher is trusted. In the case where the macro doesn't have a valid signature, but you trust it and don't want to be notified again, instead of changing the default Trust Center settings to a less safe macro security setting, it is better to move the document to a trusted location. Documents in trusted locations are allowed to run without being checked by the Trust Center security system.

Depending on the situation, the security dialog box describes the specific problem. The following table lists the possible problems and offers advice on what you should or should not do in each case.

Problem Advice
Macro is not signed     Because the macro is not digitally signed, the identity of the macro publisher cannot be verified. Therefore, it is not possible to determine if the macro is safe or not. Before you enable unsigned macros, make sure the macro is from a trustworthy source. You can still work in your document even though you don't enable the macro.
Macro signature is not trusted     The macro is potentially unsafe, because the macro has been digitally signed, the signature is valid, and you have not chosen to trust the publisher who signed the macro. You can explicitly trust (trust: Indicates whether you trust the individual or group to whom the certificate is issued. The default setting is Inherit Trust from Issuer, which means that the certificate is trusted because the issuer, usually a certificate authority, is trusted.) the macro publisher by clicking Trust all documents from this publisher in the security dialog box. This option appears only if the signature is valid. Clicking this option adds the publisher to your Trusted Publishers list in the Trust Center.
Macro signature is invalid     The macro is potentially unsafe, because the macro has been digitally signed and the signature is invalid. We recommend that you don't enable macros with invalid signatures. One possible reason the signature is invalid is that it has been tampered with. For more information, see How to tell if a digital signature is trustworthy.
Macro signature has expired     The macro is potentially unsafe, because the macro has been digitally signed and the signature has expired. Before enabling macros with expired signatures, make sure the macro is from a trustworthy source. If you have used this document in the past without any security issues, there is potentially less risk to enabling the macro.
 
 
Applies to:
Access 2007, Excel 2007, InfoPath 2007, PowerPoint 2007, Publisher 2007, Visio 2007, Word 2007