365 Apps CVE-2026-20957
HIGHCVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionNVD
Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
AnalysisAI
Arbitrary code execution in Microsoft Office Excel results from an integer underflow vulnerability in the Long Term Servicing Channel and Online Server editions, exploitable by local attackers with user interaction. This HIGH severity flaw (CVSS 7.8) grants full system compromise capabilities including code execution, data theft, and service disruption with no available patch.
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RemediationAI
Within 7 days: Identify all affected systems and apply vendor patches promptly. If patching is delayed, consider network segmentation to limit exposure.
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