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Vulnerability record · CVE-2026-20953 · published 13 January 2026

CVE-2026-20953: Microsoft 365 apps use after free vulnerability

Microsoft · 365 Apps

Use after free in Microsoft Office allows an unauthorized attacker to execute code locally.

8.4 CVSS 3.1 High EPSS 0.59% · top 54.1% CWE-416 · Use after free
8.4CVSS 3.1 base score
0.59%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
1References
17 Jun 2026Last modified by NVD

Description

Use after free in Microsoft Office allows an unauthorized attacker to execute code locally.

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

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20953 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-20953), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.