CVE-2026-20957

HighCVSS 7.8/10Last modified Jun 17, 2026

Description

Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-122CWE-191

Affected software

No affected versions have been published.

Timeline

Published
Jan 13, 2026
Last modified
Jun 17, 2026
NVD status
Analyzed

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CVE-2026-20957: High severity, CVSS 7.8 | Vulnix