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

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

  - Use after free in Microsoft Office PowerPoint allows an unauthorized attacker to execute code over a     network. (CVE-2026-70215, CVE-2026-88144, CVE-2026-88178)

  - Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over     a network. (CVE-2026-100210, CVE-2026-77902, CVE-2026-88145, CVE-2026-97003, CVE-2026-97004,     CVE-2026-97007, CVE-2026-97741, CVE-2026-97748, CVE-2026-97751, CVE-2026-97753, CVE-2026-97754,     CVE-2026-97756, CVE-2026-97757, CVE-2026-97758, CVE-2026-97763, CVE-2026-97765, CVE-2026-97766,     CVE-2026-97768, CVE-2026-97769, CVE-2026-97773, CVE-2026-97776, CVE-2026-97777, CVE-2026-97780)

  - Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
    (CVE-2026-100209, CVE-2026-100211, CVE-2026-100212, CVE-2026-97010, CVE-2026-97017, CVE-2026-97738,     CVE-2026-97745, CVE-2026-97747, CVE-2026-97752, CVE-2026-97759, CVE-2026-97771, CVE-2026-97775)

  - Heap-based buffer overflow in Microsoft Office OneNote allows an unauthorized attacker to execute code     over a network. (CVE-2026-102858)

  - Heap-based buffer overflow in Microsoft Office PowerPoint allows an unauthorized attacker to execute code     over a network. (CVE-2026-105599, CVE-2026-88207)

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 security updates. It is, therefore, affected by multiple vulnerabilities:

  - Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a     network. (CVE-2026-97003, CVE-2026-97004, CVE-2026-97007, CVE-2026-97741, CVE-2026-97748,     CVE-2026-97751, CVE-2026-97753, CVE-2026-97754, CVE-2026-97756, CVE-2026-97757, CVE-2026-97758,     CVE-2026-97763, CVE-2026-97765, CVE-2026-97766, CVE-2026-97768, CVE-2026-97769, CVE-2026-97773,     CVE-2026-97776, CVE-2026-97777, CVE-2026-97780, CVE-2026-100210)

  - Stack-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over     a network. (CVE-2026-97742, CVE-2026-97750, CVE-2026-97761, CVE-2026-97770)

  - Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
    (CVE-2026-97010, CVE-2026-97017, CVE-2026-97738, CVE-2026-97745, CVE-2026-97747, CVE-2026-97752,     CVE-2026-97759, CVE-2026-97771, CVE-2026-97775, CVE-2026-100209, CVE-2026-100211, CVE-2026-100212)

  - Double free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
    (CVE-2026-97767, CVE-2026-97772)

  - Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code over a     network. (CVE-2026-97755, CVE-2026-105718)

  - Out-of-bounds write in Microsoft Office Excel allows an unauthorized attacker to execute code over a     network. (CVE-2026-97762)

  - Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute     code over a network. (CVE-2026-97739, CVE-2026-97746)

  - Integer overflow or wraparound in Microsoft Office Excel allows an unauthorized attacker to execute code     over a network. (CVE-2026-97778)

  - Buffer underwrite ('buffer underflow') in Microsoft Office Excel allows an unauthorized attacker to execute     code over a network. (CVE-2026-97008)

  - Use of uninitialized resource in Microsoft Office Excel allows an unauthorized attacker to execute code     over a network. (CVE-2026-97011)

  - Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a     network. (CVE-2026-97760, CVE-2026-97779)

  - Use after free in Microsoft Office Excel allows an unauthorized attacker to disclose information over a     network. (CVE-2026-97743)

  - Exposure of sensitive system information to an unauthorized control sphere in Microsoft Office Excel allows     an unauthorized attacker to disclose information over a network. (CVE-2026-97740)

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 over     a network. (CVE-2026-100210, CVE-2026-97003, CVE-2026-97004, CVE-2026-97007, CVE-2026-97748,     CVE-2026-97751, CVE-2026-97753, CVE-2026-97754, CVE-2026-97756, CVE-2026-97757, CVE-2026-97758,     CVE-2026-97763, CVE-2026-97765, CVE-2026-97766, CVE-2026-97768, CVE-2026-97769, CVE-2026-97773,     CVE-2026-97776, CVE-2026-97777, CVE-2026-97780)

  - Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
    (CVE-2026-100212, CVE-2026-97010, CVE-2026-97017, CVE-2026-97738, CVE-2026-97747, CVE-2026-97752,     CVE-2026-97771, CVE-2026-97775)

  - Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code over a     network. (CVE-2026-105718, CVE-2026-97755)

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
365982	Security Updates for Microsoft Office Products (October 2026) (macOS)	Nessus	MacOS X Local Security Checks	Local	critical
365621	Security Updates for Microsoft Excel Products C2R (October 2026)	Nessus	Windows	Local	high
365474	Security Updates for Microsoft Office Online Server (October 2026)	Nessus	Windows : Microsoft Bulletins	Local	high

Detections

Analytics

CVE-2026-105718

high

Tenable Plugins

critical

high

high