PatchSiren cyber security CVE debrief
CVE-2026-67293 FreeRDP CVE debrief
AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-08-01T13:16:58.380Z and has not been modified since then. CVE-2026-67293 is an improper certificate hostname validation vulnerability in FreeRDP before 3.29.0. The TLS hostname matcher incorrectly accepts wildcard certificates for multi-label subdomains, potentially weakening TLS server authentication under wildcard-certificate conditions. Users of FreeRDP should be aware of this vulnerability and take steps to mitigate it, including reviewing and adjusting TLS server authentication configurations as necessary and ensuring proper certificate validation. Limited details are provided in the source corpus. Users should verify FreeRDP versions and configurations to understand potential exposure.
- Vendor
- FreeRDP
- Product
- Unknown
- CVSS
- CRITICAL 9.3
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-08-01
- Original CVE updated
- 2026-08-01
- Advisory published
- 2026-08-01
- Advisory updated
- 2026-08-01
Who should care
Users of FreeRDP, especially those relying on TLS authentication, should be aware of this vulnerability and take steps to mitigate it. This includes reviewing and adjusting TLS server authentication configurations as necessary and ensuring proper certificate validation. Security teams and vulnerability management teams should prioritize patching and verifying FreeRDP versions to prevent potential TLS authentication weaknesses.
Technical summary
CVE-2026-67293 is an improper certificate hostname validation vulnerability in FreeRDP before 3.29.0. The TLS hostname matcher incorrectly accepts wildcard certificates for multi-label subdomains, potentially weakening TLS server authentication under wildcard-certificate conditions. Users of FreeRDP should be aware of this vulnerability and take steps to mitigate it by reviewing and adjusting TLS server authentication configurations as necessary and ensuring proper certificate validation. This vulnerability affects FreeRDP versions prior to 3.29.0, and users should prioritize patching to prevent potential TLS authentication weaknesses. Defensive measures include verifying FreeRDP configurations for proper certificate validation and reviewing compensating controls for exposed systems.
Defensive priority
FreeRDP users should prioritize patching to prevent potential TLS authentication weaknesses.
Recommended defensive actions
- Inventory and verify FreeRDP versions, checking for versions older than 3.29.0
- Apply patches or updates to FreeRDP to address the improper certificate hostname validation vulnerability
- Review and adjust TLS server authentication configurations as necessary
- Verify FreeRDP configurations for proper certificate validation
- Review compensating controls for exposed systems while remediation is scheduled and verified
- Check relevant monitoring, detection, and logs for exposed assets that need extra review
- Track exceptions, retest remediated assets, and close the item only after evidence is documented
Evidence notes
The CVE-2026-67293 record indicates FreeRDP before 3.29.0 has an improper certificate hostname validation vulnerability. Limited details are provided in the source corpus. Users should verify FreeRDP versions and configurations to understand potential exposure. Defensive measures include reviewing TLS server authentication configurations and ensuring proper certificate validation.
Official resources
AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-08-01T13:16:58.380Z and has not been modified since then.