Office Long Term Servicing Channel
CVE-2026-21261
MEDIUM
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Lifecycle Timeline
2DescriptionCVE.org
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
AnalysisAI
Information disclosure in Microsoft Office Excel and related products results from an out-of-bounds read vulnerability that requires local access and user interaction to exploit. An attacker can leverage this flaw to read sensitive data from memory on an affected system. No patch is currently available for this vulnerability affecting Office Long Term Servicing Channel, 365 Apps, and Office Online Server.
Technical ContextAI
Classified as CWE-125 (Out-of-bounds Read). Affects 365 Apps. Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
RemediationAI
Monitor vendor advisories for a patch.
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Same weakness CWE-125 – Out-of-bounds Read
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External POC / Exploit Code
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