Vulnerability in Microsoft 365_apps
CVE-2026-20949
Improper access control in Microsoft Office Excel allows an unauthorized attacker to bypass a security feature locally.
EPSS: 0.004 (32.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Microsoft 365_apps
- Microsoft 365 Apps For Enterprise — versions 16.0.1
- Microsoft Office Ltsc 2021 — versions 16.0.1
- Microsoft Office Ltsc 2024 — versions 16.0.0
- Microsoft Office Ltsc For Mac 2021 — versions 16.0.1
- Microsoft Office Ltsc For Mac 2024 — versions 16.0.0
- Microsoft Office_long_term_servicing_channel — versions 2021, 2024
Weakness classification (CWE)
References
- secure@microsoft.com (vendor-advisory, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-20949?
- CVE-2026-20949 is a high-severity vulnerability in Microsoft 365_apps, classified under Improper Access Control. CVSS score: 7.8/10. Published 2026-01-13.
- How severe is CVE-2026-20949?
- High severity. CVSS v3 base score is 7.8 out of 10.