Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

PT - office_for_mac (smb_nt_ms26_may_office_for_mac.nasl)

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

  - Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
    (CVE-2026-40359)

  - Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information     locally. (CVE-2026-40360)

  - Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code     locally. (CVE-2026-40362)

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 may-12-2026 advisory.

  - Untrusted pointer dereference in Microsoft Office Word allows an unauthorized attacker to execute code     locally. (CVE-2026-40367)

  - Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
    (CVE-2026-40359)

  - Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information     locally. (CVE-2026-40360)

  - Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code     locally. (CVE-2026-40362)

  - Use after free in Microsoft Office allows an unauthorized attacker to execute code locally.
    (CVE-2026-40358)

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:

  - Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
    (CVE-2026-40359)

  - Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code     locally. (CVE-2026-40362)

  - Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information     locally. (CVE-2026-40360)

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 or Office Web Apps installation on the remote host is missing security updates. It is, therefore, affected by multiple vulnerabilities:

  - Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
    (CVE-2026-40359)

  - Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information     locally. (CVE-2026-40360)

  - Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code     locally. (CVE-2026-40362)

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
314676	Security Updates for Microsoft Excel Products C2R (May 2026)	Nessus	Windows	Local	high
314356	Security Updates for Microsoft Office Products (May 2026) (macOS)	Nessus	MacOS X Local Security Checks	Local	high
314351	Security Updates for Microsoft Excel Products (May 2026)	Nessus	Windows : Microsoft Bulletins	Local	high
314339	Security Updates for Microsoft Office Online Server (May 2026)	Nessus	Windows : Microsoft Bulletins	Local	high

Detections

Analytics

CVE-2026-40359

high

Tenable Plugins

Coming Soon

high

high

high

high