CVE-2026-40421 json
Microsoft Word Information Disclosure Vulnerability
published 2026-05-12 5 mo ago modified 2026-10-26 13 d ago also EUVD-2026-29678
- cvss
- 4.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 49%
- public exploits
- 0
- none known
Summary
Files or directories accessible to external parties in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
Patch / fix
- Microsoft Microsoft Word 2016 16.0.5552.1000
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5 mo ago
Exploit prediction
0.62% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C |
| CNA | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N |
Affected products
- Microsoft Microsoft 365 Apps for Enterprise
- Microsoft Microsoft Office 2019
- Microsoft Microsoft Office LTSC 2021
- Microsoft Microsoft Office LTSC 2024
- Microsoft Microsoft Word 2016
Classification
- Weakness
-
- CWE-73 External Control of File Name or Path
References
-
msrc.microsoft.com
/update-guide/vulnerability/CVE-2026-40421
vendor-advisory, patch
Sources
- CVE List CVE-2026-40421
- NVD CVE-2026-40421
Fencer Vulns 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.