Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.

The version of Microsoft Office for Mac installed on the remote host is affected by multiple vulnerabilities as referenced in the july-14-2026 advisory.

  - Out-of-bounds read in Microsoft Office allows an unauthorized attacker to execute code locally.
    (CVE-2026-55045)

  - Stack-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code     locally. (CVE-2026-55141, CVE-2026-55899)

  - Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
    (CVE-2026-47642, CVE-2026-54131, CVE-2026-55948)

  - Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to disclose     information locally. (CVE-2026-48580, CVE-2026-55138)

  - Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information     locally. (CVE-2026-50408, CVE-2026-54988, CVE-2026-55046, CVE-2026-55122, CVE-2026-55898)

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

  - Out-of-bounds read in Microsoft Office allows an unauthorized attacker to execute code locally.
    (CVE-2026-55045)

  - Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code     locally. (CVE-2026-50301, CVE-2026-55017, CVE-2026-55049, CVE-2026-55056, CVE-2026-55125,     CVE-2026-55129, CVE-2026-55140)

  - Use after free in Microsoft Office allows an unauthorized attacker to execute code locally.
    (CVE-2026-47290, CVE-2026-50314, CVE-2026-50467, CVE-2026-55018)

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	Severity
326952	Security Updates for Microsoft Office Products (July 2026) (macOS)	Nessus	MacOS X Local Security Checks	high
326874	Security Updates for Microsoft Office Products (July 2026)	Nessus	Windows : Microsoft Bulletins	high

Detections

Analytics

CVE-2026-55023

medium

Tenable Plugins

high

high