Vulnerability Description
Postiz is an AI social media scheduling tool. From version 2.16.6 to before version 2.21.7, all SSRF protections added in v2.21.4–v2.21.6 share a fundamental TOCTOU (Time-of-Check-Time-of-Use) vulnerability: isSafePublicHttpsUrl() resolves DNS to validate the target IP, but subsequent fetch() calls resolve DNS independently. An attacker controlling a DNS server can exploit this gap via DNS rebinding to redirect requests to internal network addresses. This issue has been patched in version 2.21.7.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/gitroomhq/postiz-app/commit/071143dcb01cdeb9d5d7019892f4c6ff7
- https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.7
- https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-f7jj-p389-4w45
FAQ
What is CVE-2026-42346?
CVE-2026-42346 is a vulnerability with a CVSS score of 6.5 (MEDIUM). Postiz is an AI social media scheduling tool. From version 2.16.6 to before version 2.21.7, all SSRF protections added in v2.21.4–v2.21.6 share a fundamental TOCTOU (Time-of-Check-Time-of-Use) vulnera...
How severe is CVE-2026-42346?
CVE-2026-42346 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-42346?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.