Free of memory not on the heap 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 september-16-2025 advisory.

  - Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
    (CVE-2025-54910)

  - Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
    (CVE-2025-54896, CVE-2025-54903, CVE-2025-54904)

  - Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
    (CVE-2025-54898, CVE-2025-54902)

  - Free of memory not on the heap in Microsoft Office Excel allows an unauthorized attacker to execute code     locally. (CVE-2025-54899)

  - Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code     locally. (CVE-2025-54900)

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-2025-54896, CVE-2025-54898, CVE-2025-54899, CVE-2025-54900,     CVE-2025-54902, CVE-2025-54903, CVE-2025-54904)

  - An information disclosure vulnerability. (CVE-2025-54901)     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-2025-54896, CVE-2025-54898, CVE-2025-54899, CVE-2025-54900,     CVE-2025-54902, CVE-2025-54903, CVE-2025-54904)

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
265140	Security Updates for Microsoft Office Products (September 2025) (macOS)	Nessus	MacOS X Local Security Checks	Local	high
264571	Security Updates for Microsoft Excel Products C2R (September 2025)	Nessus	Windows	Local	high
261813	Security Updates for Microsoft Excel Products (September 2025)	Nessus	Windows : Microsoft Bulletins	Local	high

Detections

Analytics

CVE-2025-54899

high

Tenable Plugins

high

high

high