CVE-2026-42346

Medium

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.

SeverityMedium

CVSS6.5

Exploit probability—

ProductGitroomhq Postiz-app

PublishedMay 8, 2026

First seenMay 8, 2026

Weakness typeCWE-918Server-side request forgery (SSRF)

How to fix

Sources list no fixed version or patch link for this vulnerability.

Affected products

Product	Affected versions	Fixed in
gitroomhq postiz-app	>= 2.16.6, < 2.21.7	—

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