Use after free in Microsoft Office Word 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 june-16-2026 advisory.

  - Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
    (CVE-2026-44819, CVE-2026-44824, CVE-2026-45461, CVE-2026-45463, CVE-2026-45472, CVE-2026-45474,     CVE-2026-45475, CVE-2026-45645)

  - Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over     a network. (CVE-2026-44822, CVE-2026-45455)

  - Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to     execute code locally. (CVE-2026-44817, CVE-2026-44818, CVE-2026-44820, CVE-2026-44823, CVE-2026-45469)

  - Protection mechanism failure in Microsoft Office Excel allows an unauthorized attacker to bypass a     security feature locally. (CVE-2026-45459)

  - Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.
    (CVE-2026-44821, CVE-2026-45460, CVE-2026-45485)

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

The Microsoft Word Products are missing security updates. It is, therefore, affected by multiple vulnerabilities:

  - Access of resource using incompatible type ('type confusion') in Microsoft Office allows an unauthorized     attacker to execute code locally. (CVE-2026-45456, CVE-2026-45458)

  - Untrusted pointer dereference in Microsoft Office Word allows an unauthorized attacker to execute code     locally. (CVE-2026-45457, CVE-2026-45471, CVE-2026-45486, CVE-2026-45643)

  - Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to disclose     information locally. (CVE-2026-45466)

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
321311	Security Updates for Microsoft Office Products (June 2026) (macOS)	Nessus	MacOS X Local Security Checks	Local	medium
320864	Security Updates for Microsoft Word Products C2R (June 2026)	Nessus	Windows	Local	high

Detections

Analytics

CVE-2026-45486

high

Tenable Plugins

medium

high