CVE-2026-44818 json
Microsoft Excel Remote Code Execution Vulnerability
published 5mo ago modified last mo. also EUVD-2026-35661
- cvss
- 7.0
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 18%
- public exploits
- 0
- none known
Summary
Concurrent execution using shared resource with improper synchronization ('race condition') in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Patch / fix
- Microsoft Microsoft Excel 2016 16.0.5556.1001
- Microsoft Microsoft Office 365 for Mac 16.110.26061317
- Microsoft Microsoft Office LTSC for Mac 2021 16.110.26061317
- Microsoft Microsoft Office LTSC for Mac 2024 16.110.26061317
- Microsoft Office Online Server 16.0.10417.20137
Is CVE-2026-44818 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 4mo ago
Exploit prediction
0.26% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.0 | CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C |
| CNA | 3.1 | 7.0 | CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
Affected products
- Microsoft Microsoft 365 Apps for Enterprise
- Microsoft Microsoft Excel 2016
- Microsoft Microsoft Office 2019
- Microsoft Microsoft Office 365 for Mac
- Microsoft Microsoft Office LTSC 2021
- Microsoft Microsoft Office LTSC 2024
- Microsoft Microsoft Office LTSC for Mac 2021
- Microsoft Microsoft Office LTSC for Mac 2024
- Microsoft Office Online Server
Classification
- Weakness
-
- CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization
References
-
msrc.microsoft.com
/update-guide/vulnerability/CVE-2026-44818
vendor-advisory, patch
Sources
- CVE List CVE-2026-44818
- NVD CVE-2026-44818
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.