CVE-2026-20949
Microsoft Excel Security Feature Bypass Vulnerability
Improper access control in Microsoft Office Excel allows an unauthorized attacker to bypass a security feature locally.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Microsoft Excel Security Feature Bypass Vulnerability
Improper access control in Microsoft Office Excel allows an unauthorized attacker to bypass a security feature locally.
- Record
CVE-2026-20949- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Weakness
- CWE-284
- Updated
- 2026-11-02
EUVDEUVD-2026-2145
Improper access control in Microsoft Office Excel allows an unauthorized attacker to bypass a security feature locally.
- Record
EUVD-2026-2145- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-2vvv-3xfp-234v
Improper access control in Microsoft Office Excel allows an unauthorized attacker to bypass a...
Improper access control in Microsoft Office Excel allows an unauthorized attacker to bypass a security feature locally.
- Record
GHSA-2vvv-3xfp-234v- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Weakness
- CWE-284
- Updated
- 2026-11-02
NVD
Improper access control in Microsoft Office Excel allows an unauthorized attacker to bypass a security feature locally.
- Record
CVE-2026-20949- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Weakness
- CWE-284
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-20949 is a high vulnerability (CVSS 7.8) in Microsoft 365 Apps, published January 13, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.46%, the 40th percentile. No source names a fixed version.