GCVE-110-NCSC-2026-58

Advisory PublishedCVSS 7.8/10

Vulnetix · Advisory published February 10, 2026

A heap-based buffer overflow vulnerability in Microsoft Office Excel allows unauthorized attackers to locally elevate their privileges.

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Weaknesses (CWE)

CWE-200Exposure of Sensitive Information to an Unauthorized ActorCWE-122Heap-based Buffer OverflowCWE-125Out-of-bounds ReadCWE-502Deserialization of Untrusted DataCWE-807Reliance on Untrusted Inputs in a Security Decision

Risk Scores

CVSS 3.1

7.8/10

High · CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Affected Products

Vendor	Product	Versions	Platforms
Microsoft	vers:unknown/*	—	—

Aliases

CVE-2026-21258 CVE-2026-21259 CVE-2026-21260 CVE-2026-21261 CVE-2026-21511 CVE-2026-21514

References

advisory

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