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

  - Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code over a     network. (CVE-2026-78518)

  - Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code     locally. (CVE-2026-81386, CVE-2026-81389, CVE-2026-81397, CVE-2026-81398, CVE-2026-81947, CVE-2026-81948,     CVE-2026-81951, CVE-2026-81959, CVE-2026-81960)

  - Stack-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code     locally. (CVE-2026-81388, CVE-2026-81396, CVE-2026-81953)

  - Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
    (CVE-2026-81954)

  - Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information     locally. (CVE-2026-81390, CVE-2026-81392, CVE-2026-81393, CVE-2026-81395, CVE-2026-81400, CVE-2026-85875)

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:

  - Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code     locally. (CVE-2026-81947)

  - Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
    (CVE-2026-81956)

  - Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information     locally. (CVE-2026-81390)

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:

  - Insufficiently protected credentials in Microsoft Office allows an unauthorized attacker to perform     spoofing over a network. (CVE-2026-64918)

  - Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code over     a network. (CVE-2026-69285, CVE-2026-69442, CVE-2026-78505)

  - Heap-based buffer overflow in Microsoft Office Access allows an unauthorized attacker to execute     code over a network. (CVE-2026-69529, CVE-2026-69778)

  - Buffer over-read in Microsoft Office allows an unauthorized attacker to disclose information over a     network. (CVE-2026-69626)

  - Integer overflow or wraparound in Microsoft Office Word allows an unauthorized attacker to disclose     information over a network. (CVE-2026-69734)

  - Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information over     a network. (CVE-2026-69739, CVE-2026-80089)

  - Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code     over a network. (CVE-2026-69764, CVE-2026-78510, CVE-2026-78526, CVE-2026-81952)

  - Buffer over-read in Microsoft Office Excel allows an unauthorized attacker to disclose information     over a network. (CVE-2026-72974)

  - Numeric truncation error in Microsoft Office Word allows an unauthorized attacker to execute code     over a network. (CVE-2026-78512)

  - Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information     over a network. (CVE-2026-78515)

  - Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code over a     network. (CVE-2026-78518)

  - Out-of-bounds write in Microsoft Office allows an unauthorized attacker to execute code over a     network. (CVE-2026-78524)

  - Out-of-bounds read in Microsoft Office Outlook allows an unauthorized attacker to disclose     information over a network. (CVE-2026-80084)

  - Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to disclose     information over a network. (CVE-2026-80087)

  - Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose information     over a network. (CVE-2026-80088)

  - Use of uninitialized resource in Microsoft Office allows an unauthorized attacker to disclose     information over a network. (CVE-2026-80091)

  - Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code     locally. (CVE-2026-81386, CVE-2026-81389, CVE-2026-81397, CVE-2026-81398, CVE-2026-81947,     CVE-2026-81948, CVE-2026-81951, CVE-2026-81959, CVE-2026-81960)

  - Exposure of sensitive system information to an unauthorized control sphere in Microsoft Office Excel     allows an unauthorized attacker to disclose information locally. (CVE-2026-81387, CVE-2026-81394)

  - Stack-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute     code locally. (CVE-2026-81388, CVE-2026-81396, CVE-2026-81953)

  - Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information     locally. (CVE-2026-81390, CVE-2026-81392, CVE-2026-81393, CVE-2026-81395, CVE-2026-81400,     CVE-2026-85875)

  - Use of uninitialized resource in Microsoft Office Excel allows an unauthorized attacker to disclose     information locally. (CVE-2026-81391, CVE-2026-81958)

  - Buffer over-read in Microsoft Office Excel allows an unauthorized attacker to disclose information     locally. (CVE-2026-81399)

  - Access of resource using incompatible type ('type confusion') in Microsoft Office Excel allows an     unauthorized attacker to disclose information locally. (CVE-2026-81401)

  - Integer overflow or wraparound in Microsoft Office Excel allows an unauthorized attacker to execute     code locally. (CVE-2026-81949)

  - Double free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
    (CVE-2026-81950)

  - Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
    (CVE-2026-81954)

  - Heap-based buffer overflow in Microsoft Graphics Component allows an unauthorized attacker to     execute code over a network. (CVE-2026-81955)

  - Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code     locally. (CVE-2026-81956, CVE-2026-81957)

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:

  - Numeric truncation error in Microsoft Office Word allows an unauthorized attacker to execute code     over a network. (CVE-2026-78512)

  - Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code over a     network. (CVE-2026-78518)

  - Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code     locally. (CVE-2026-81386, CVE-2026-81389, CVE-2026-81397, CVE-2026-81398, CVE-2026-81947,     CVE-2026-81948, CVE-2026-81951, CVE-2026-81959, CVE-2026-81960)

  - Exposure of sensitive system information to an unauthorized control sphere in Microsoft Office Excel     allows an unauthorized attacker to disclose information locally. (CVE-2026-81387, CVE-2026-81394)

  - Stack-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute     code locally. (CVE-2026-81388, CVE-2026-81396, CVE-2026-81953)

  - Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information     locally. (CVE-2026-81390, CVE-2026-81392, CVE-2026-81393, CVE-2026-81395, CVE-2026-81400,     CVE-2026-85875)

  - Use of uninitialized resource in Microsoft Office Excel allows an unauthorized attacker to disclose     information locally. (CVE-2026-81391, CVE-2026-81958)

  - Buffer over-read in Microsoft Office Excel allows an unauthorized attacker to disclose information     locally. (CVE-2026-81399)

  - Access of resource using incompatible type ('type confusion') in Microsoft Office Excel allows an     unauthorized attacker to disclose information locally. (CVE-2026-81401)

  - Integer overflow or wraparound in Microsoft Office Excel allows an unauthorized attacker to execute     code locally. (CVE-2026-81949)

  - Double free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
    (CVE-2026-81950)

  - Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
    (CVE-2026-81954)

  - Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code     locally. (CVE-2026-81956, CVE-2026-81957)

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	Published	Updated	Severity
344559	Security Updates for Microsoft Excel Products C2R (September 2026)	Nessus	Windows	9/10/2026	9/10/2026	high
344556	Security Updates for Microsoft Office Online Server (September 2026)	Nessus	Windows : Microsoft Bulletins	9/10/2026	9/10/2026	high
344286	Security Updates for Microsoft Office Products (September 2026)	Nessus	Windows : Microsoft Bulletins	9/9/2026	9/10/2026	high
344285	Security Updates for Microsoft Excel Products (September 2026)	Nessus	Windows : Microsoft Bulletins	9/9/2026	9/10/2026	high

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