CVE tracker / CVE-2026-55139
CVE-2026-55139
CVE-2026-55139 is the Microsoft Office Information Disclosure Vulnerability. Microsoft rates it Important, CVSS 5.5. It is not in CISA's Known Exploited Vulnerabilities catalog. Published July 14, 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
Less Likely
Microsoft: exploitation
No
In CISA KEV
Microsoft describes it: “Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.”
How to fix it
Microsoft lists 13 affected products and the update that fixes each:
- KB5002887 · fixed build 16.0.5561.1000
Microsoft Office 2016 (64-bit edition), Microsoft Office 2016 (32-bit edition) - Click to Run · fixed build https://aka.ms/OfficeSecurityReleases
Microsoft Office LTSC 2024 for 64-bit editions, 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 365 Apps for Enterprise for 64-bit Systems, and 3 more - Release Notes · fixed build 16.111.26071215
Microsoft Office 365 for Mac, Microsoft Office LTSC for Mac 2024, Microsoft Office LTSC for Mac 2021
What Microsoft changed
- July 14, 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
- July 14, 2026
- Last revised
- July 14, 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.