CVE-2026-21261

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CVSS 3.1

5.5 medium

EPSS

<1%p48

Published

Feb 10, 2026 (Feb 10, 2026)

Modified

Jun 17, 2026

Description

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

Vendors: microsoft
Products: 365 apps, excel, office, office long term servicing channel, office online server
Weakness: CWE-125
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

NVD CVE.org GitHub PoCs EPSS (0.6%)

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