CVE-2023-35311
High 8.8 Exploited in the wild (KEV)
Confirmed active exploitation — CISA KEV catalog
- Name
- Microsoft Outlook Security Feature Bypass Vulnerability
- Added to catalog
- Remediation due date (US federal)
- Required action
- Apply updates per vendor instructions or discontinue use of the product if updates are unavailable.
Description
Microsoft Outlook Security Feature Bypass Vulnerability
Metrics
- CVSS 3.1
-
8.8 (HIGH)
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 16% (percentile: 97) as of 2 November 2026
- CWE
- CWE-367
Affected products
microsoft: 365 apps; microsoft: office 2019; microsoft: office 2021; microsoft: outlook
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-35311 PatchVendor Advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-35311 PatchVendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023… US Government Resource