CVE tracker / CVE-2026-83951
CVE-2026-83951
CVE-2026-83951 is the Microsoft Office Word Information Disclosure Vulnerability. Microsoft rates it Important, CVSS 5.5. It is not in CISA's Known Exploited Vulnerabilities catalog. Published September 8, 2026.
Risk summary
MediumInformation Disclosure
5.5
CVSS v3 base
0.5%
EPSS: chance of exploitation in 30 days
Medium
Severity
Important
Microsoft's rating
Unlikely
Microsoft: exploitation
No
In CISA KEV
Microsoft describes it: “Buffer over-read in Microsoft Office Word allows an unauthorized attacker to disclose information locally.”
How to fix it
Microsoft lists 10 affected products and the update that fixes each:
- KB5002923 · fixed build 16.0.5569.1000
Microsoft Word 2016 (32-bit edition), Microsoft Word 2016 (64-bit edition) - Release Notes · fixed build 16.0.10417.20207, 16.0.20326.20138, 16.0.17932.20976
Microsoft Office 2019 for 64-bit editions, Microsoft 365 Apps for Enterprise for 64-bit Systems, Microsoft Office LTSC 2024 for 32-bit editions, Microsoft Office LTSC 2024 for 64-bit editions, Microsoft 365 Apps for Enterprise for 32-bit Systems, and 3 more
What Microsoft changed
- September 8, 2026: Information published.
Details
- Weakness
- CWE-126: Buffer Over-read
- Publicly disclosed (Microsoft)
- No
- Exploited (Microsoft)
- No
- Known exploited (CISA KEV)
- Not listed
- Published
- September 8, 2026
- Last revised
- September 8, 2026
Get told when this changes
Senserva Watch emails Microsoft security and patch alerts when something moves: a new exploitation report, a revised fix, a known issue. Free, one email address.
References
From Microsoft, CISA, NVD and FIRST data; the Microsoft details were read when this page was opened. Check the references above before you act.