CVE-2026-42346

Published: May 8, 2026Modified: May 19, 2026Deferred

6.5

Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

Exploitability: 2.2 / Impact: 4.2

Source: security-advisories@github.com (Secondary)

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.

Related CWEs

CWE-918

Server-Side Request Forgery (SSRF)

The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

References (3)

https://github.com/gitroomhq/postiz-app/commit/071143dcb01cdeb9d5d7019892f4c6ff7b19dbeb

Source: security-advisories@github.com

https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.7

Source: security-advisories@github.com

https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-f7jj-p389-4w45

Source: security-advisories@github.com

Timeline

No history available yet.