365 Apps CVE-2026-21258
MEDIUMCVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Lifecycle Timeline
2DescriptionNVD
Improper input validation in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
AnalysisAI
Information disclosure in Microsoft Excel allows local attackers with user interaction to read sensitive data through improper input validation in Office 365 Apps and Long Term Servicing Channel. An attacker must socially engineer a user into opening a specially crafted file to trigger the vulnerability. …
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RemediationAI
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.
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