CVE tracker / CVE-2026-77911
CVE-2026-77911
CVE-2026-77911 is the Microsoft Office Word Information Disclosure Vulnerability. Microsoft rates it Important, CVSS 6.5. It is not in CISA's Known Exploited Vulnerabilities catalog. Published September 8, 2026.
Risk summary
Microsoft describes it: “Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose information over a network.”
How to fix it
Microsoft lists 13 affected products and the update that fixes each:
- KB5002923 · fixed build 16.0.5569.1002
Microsoft Word 2016 (64-bit edition), Microsoft Word 2016 (32-bit edition) - Click to Run · fixed build https://aka.ms/OfficeSecurityReleases
Microsoft Office LTSC 2024 for 32-bit editions, Microsoft Office LTSC 2021 for 32-bit editions, Microsoft Office LTSC 2021 for 64-bit editions, Microsoft Office 2019 for 32-bit editions, Microsoft 365 Apps for Enterprise for 32-bit Systems, and 2 more - Release Notes · fixed build 16.113.26091433, 16.0.17932.20960
Microsoft Office 365 for Mac, Microsoft Office LTSC for Mac 2024, Microsoft Office LTSC 2024 for 64-bit editions, Microsoft Office LTSC for Mac 2021
What Microsoft changed
- September 8, 2026: Information published.
Details
- Weakness
- CWE-125: Out-of-bounds 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.