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

The Microsoft Excel Products are missing a security update. It is, therefore, affected by multiple remote code execution vulnerabilities that attackers can exploit to bypass authentication and execute unauthorized arbitrary commands.
    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 august-12-2025 advisory.

  - Use after free in Microsoft Office Word allows an unauthorized attacker to execute code locally.
    (CVE-2025-53738, CVE-2025-53784)

  - Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
    (CVE-2025-53735)

  - Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code     locally. (CVE-2025-53737, CVE-2025-53741)

  - Access of resource using incompatible type ('type confusion') in Microsoft Office Excel allows an     unauthorized attacker to execute code locally. (CVE-2025-53739)

  - Use of uninitialized resource in Microsoft Office Excel allows an unauthorized attacker to execute code     locally. (CVE-2025-53759)

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-2025-53735, CVE-2025-53737, CVE-2025-53739, CVE-2025-53741)

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 remote code execution vulnerabilities. An attacker can exploit this to bypass authentication and execute unauthorized arbitrary commands.

ID	Name	Product	Family	Type	Severity
250282	Security Updates for Microsoft Excel Products C2R (August 2025)	Nessus	Windows	Local	high
249168	Security Updates for Microsoft Office Products (August 2025) (macOS)	Nessus	MacOS X Local Security Checks	Local	high
249128	Security Updates for Microsoft Excel Products (August 2025)	Nessus	Windows : Microsoft Bulletins	Local	high
249119	Security Updates for Microsoft Office Online Server (August 2025)	Nessus	Windows : Microsoft Bulletins	Local	high

Detections

Analytics

CVE-2025-53739

high

Tenable Plugins

high

high

high

high