Report: CVE-2026-42346 - Postiz: TOCTOU DNS rebinding bypasses all SSRF URL validation paths

Report: CVE-2026-42346 - Postiz: TOCTOU DNS rebinding bypasses all SSRF URL validation paths

CVE ID :CVE-2026-42346 Published : May 8, 2026, 11:16 p.m. | 24 minutes ago 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. Severity: 6.5 | MEDIUM Visit the link for more details, such as CVSS details, affected products, timeline, and more...

CVE Details

Severity
MEDIUM
Published
May 8, 2026
Attack Vector: network
Impact: SSRF