Security Advisory

CVE-2026-42346

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-05-08 22:26:50

Last updated 2026-05-11 14:35:55

Assigner GitHub_M

CVSS score 6.5

State PUBLISHED

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.

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