Out-of-bounds read 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 february-10-2026 advisory.

  - Use after free in Microsoft Office allows an unauthorized attacker to execute code locally.
    (CVE-2026-20952)

  - Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to execute code     locally. (CVE-2026-20955, CVE-2026-20956)

  - Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
    (CVE-2026-20946)

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-2026-20946, CVE-2026-20950, CVE-2026-20955, CVE-2026-20956,     CVE-2026-20957)

  - A security feature bypass vulnerability. (CVE-2026-20949)     Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Microsoft Office for Mac installed on the remote host is affected by multiple vulnerabilities as referenced in the january-13-2026 advisory.

  - Use after free in Microsoft Office allows an unauthorized attacker to execute code locally.
    (CVE-2026-20952, CVE-2026-20953)

  - Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to     execute code locally. (CVE-2026-20957)

  - Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
    (CVE-2026-20946)

  - Improper access control in Microsoft Office Excel allows an unauthorized attacker to bypass a security     feature locally. (CVE-2026-20949)

  - Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to execute code     locally. (CVE-2026-20955, CVE-2026-20956)

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 remote code execution vulnerabilities. An attacker can exploit these to bypass authentication and execute unauthorized arbitrary commands. (CVE-2026-20946, CVE-2026-20950, CVE-2026-20957)

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

ID	Name	Product	Family	Type	Severity
298566	Security Updates for Microsoft Office Products (February 2026) (macOS)	Nessus	MacOS X Local Security Checks	Local	high
283873	Security Updates for Microsoft Excel Products C2R (January 2026)	Nessus	Windows	Local	high
283480	Security Updates for Microsoft Office Products (January 2026) (macOS)	Nessus	MacOS X Local Security Checks	Local	high
283477	Security Updates for Microsoft Excel Products (January 2026)	Nessus	Windows : Microsoft Bulletins	Local	high

Detections

Analytics

CVE-2026-20946

high

Tenable Plugins

high

high

high

high