PT-2026-39214 · Postiz · Postiz

Published 2026-05-08 · Updated 2026-05-19 · CVE-2026-42346

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Postiz versions 2.16.6 through 2.21.6

Description Postiz is an AI social media scheduling tool. A Time-of-Check-Time-of-Use (TOCTOU) issue exists where the isSafePublicHttpsUrl() function resolves DNS to validate the target IP, but subsequent fetch() calls resolve DNS independently. An attacker controlling a DNS server can use DNS rebinding—a technique that alternates the IP address returned by a DNS query—to redirect requests to internal network addresses, leading to Server-Side Request Forgery (SSRF).

Recommendations Update to version 2.21.7.

Fix

SSRF

Weakness Enumeration

CWE-918

Related Identifiers

CVE-2026-42346

Affected Products

Postiz

References · 9

• https://nvd.nist.gov/vuln/detail/CVE-2026-42346 · Security Note
• https://github.com/gitroomhq/postiz-app/commit/071143dcb01cdeb9d5d7019892f4c6ff7b19dbeb · Note
• https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.7 · Note
• https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-f7jj-p389-4w45 · Note
• https://t.me/cveNotify/163338 · Telegram Post
• https://t.me/cveNotify/164074 · Telegram Post
• https://twitter.com/VulmonFeeds/status/2052934758653411353 · Twitter Post
• https://t.me/CVEtracker/53171 · Telegram Post
• https://twitter.com/CVEnew/status/2053131417182523685 · Twitter Post