CVE-2026-40421
Microsoft Word Information Disclosure Vulnerability
Files or directories accessible to external parties in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Microsoft Word Information Disclosure Vulnerability
Files or directories accessible to external parties in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
- Record
CVE-2026-40421- CVSS 3.1
- 4.3 Medium
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 - Weakness
- CWE-73
- Updated
- 2026-11-02
EUVDEUVD-2026-29678
Files or directories accessible to external parties in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
- Record
EUVD-2026-29678- CVSS 3.1
- 4.3 Medium
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 - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-m493-43x7-h3mj
External control of file name or path in Microsoft Office Word allows an unauthorized attacker to...
External control of file name or path in Microsoft Office Word allows an unauthorized attacker to disclose information over a network.
- Record
GHSA-m493-43x7-h3mj- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N - Weakness
- CWE-73
- Updated
- 2026-11-02
NVD
Files or directories accessible to external parties in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
- Record
CVE-2026-40421- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N - Weakness
- CWE-73
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-40421 is a medium vulnerability (CVSS 4.3) in Microsoft Office, published May 12, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.62%, the 50th percentile. No source names a fixed version.