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-2026-116927, CVE-2026-118294, CVE-2026-118297, CVE-2026-118298, CVE-2026-118299,     CVE-2026-118302, CVE-2026-118701, CVE-2026-118705, CVE-2026-118707, CVE-2026-118709, CVE-2026-118714,     CVE-2026-118718, CVE-2026-118721, CVE-2026-118722, CVE-2026-118726, CVE-2026-119986, CVE-2026-120785,     CVE-2026-120786, CVE-2026-120788, CVE-2026-120789, CVE-2026-120790, CVE-2026-120791, CVE-2026-124170,     CVE-2026-124174, CVE-2026-124176)

  - Stack-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over     a network. (CVE-2026-118292, CVE-2026-118295, CVE-2026-118700, CVE-2026-118704, CVE-2026-118711,     CVE-2026-118717, CVE-2026-118720, CVE-2026-118731)

  - Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code over a     network. (CVE-2026-118293)

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 november-10-2026 advisory.

  - Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code over a     network. (CVE-2026-116717, CVE-2026-120003)

  - Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
    (CVE-2026-118703, CVE-2026-118706, CVE-2026-118710, CVE-2026-118713, CVE-2026-118716, CVE-2026-118729,     CVE-2026-118730, CVE-2026-118732, CVE-2026-124187)

  - Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a     network. (CVE-2026-108450, CVE-2026-109500, CVE-2026-110048, CVE-2026-110050, CVE-2026-110053,     CVE-2026-110054, CVE-2026-110055, CVE-2026-110061, CVE-2026-110062, CVE-2026-110064, CVE-2026-111285,     CVE-2026-111294, CVE-2026-111295, CVE-2026-111299, CVE-2026-111306, CVE-2026-111307, CVE-2026-111310,     CVE-2026-112714, CVE-2026-112715, CVE-2026-112716, CVE-2026-112717, CVE-2026-112718, CVE-2026-112719,     CVE-2026-112721, CVE-2026-112722, CVE-2026-112723, CVE-2026-112724, CVE-2026-112726, CVE-2026-112728,     CVE-2026-112729, CVE-2026-112730, CVE-2026-112733, CVE-2026-112739, CVE-2026-112741, CVE-2026-116718,     CVE-2026-116719, CVE-2026-116720, CVE-2026-116722, CVE-2026-116923, CVE-2026-116925)

  - Stack-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over     a network. (CVE-2026-109505, CVE-2026-111287)

  - Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over     a network. (CVE-2026-111292, CVE-2026-118300, CVE-2026-118727, CVE-2026-118728, CVE-2026-119999,     CVE-2026-124178, CVE-2026-124179)

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

ID	名前	製品	ファミリー	公開日	更新日	深刻度
378498	Security Updates for Microsoft Office Online Server (November 2026)	Nessus	Windows : Microsoft Bulletins	2026/11/10	2026/11/10	high
378503	Security Updates for Microsoft Office Products (November 2026) (macOS)	Nessus	MacOS X Local Security Checks	2026/11/10	2026/11/10	high

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