Access of resource using incompatible type ('type confusion') in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

The version of Microsoft Office for Mac installed on the remote host is affected by multiple vulnerabilities as referenced in the October 2025 advisory, including:

  - Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally. (CVE-2025-59236)

  - Use after free in Microsoft Office Word allows an unauthorized attacker to execute code locally. (CVE-2025-59222)

  - Use after free in Microsoft Office allows an unauthorized attacker to execute code locally. (CVE-2025-59227)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Microsoft Excel Products are missing a security update. It is, therefore, affected by the following vulnerabilities:

  - Multiple remote code execution vulnerabilities that attackers can exploit to bypass authentication and     execute unauthorized arbitrary commands. (CVE-2025-59223, CVE-2025-59224, CVE-2025-59225, CVE-2025-59231,     CVE-2025-59233, CVE-2025-59236, CVE-2025-59243)

  - Information disclosure vulnerabilities. (CVE-2025-59232, CVE-2025-59235)     Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Microsoft Excel Products are missing a security update. They are, therefore, affected by multiple vulnerabilities:

  - A remote code execution vulnerability. An attacker can exploit this to bypass authentication and execute     unauthorized arbitrary commands. (CVE-2025-59223, CVE-2025-59224, CVE-2025-59225, CVE-2025-59231,     CVE-2025-59233)

  - An information disclosure vulnerability. An attacker can exploit this to disclose potentially sensitive     information. (CVE-2025-59232, CVE-2025-59235)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Microsoft Office Online Server installation on the remote host is missing security updates. It is, therefore, affected by multiple vulnerabilities.

  - Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
    (CVE-2025-59223, CVE-2025-59224, CVE-2025-59225, CVE-2025-59236)

  - Access of resource using incompatible type ('type confusion') in Microsoft Office Excel allows an     unauthorized attacker to execute code locally. (CVE-2025-59231, CVE-2025-59233)

  - Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information     locally. (CVE-2025-59232, CVE-2025-59235)

ID	Name	Product	Family	Severity
274405	Security Updates for Microsoft Office Products (October 2025) (macOS)	Nessus	MacOS X Local Security Checks	high
271234	Security Updates for Microsoft Excel Products C2R (October 2025)	Nessus	Windows	high
270389	Security Updates for Microsoft Excel Products (October 2025)	Nessus	Windows : Microsoft Bulletins	high
270376	Security Updates for Microsoft Office Online Server (October 2025)	Nessus	Windows : Microsoft Bulletins	high

Detections

Analytics

CVE-2025-59231

high

Tenable Plugins

high

high

high

high