PT-2026-50121 · Gitroomhq · Postiz-App

Published 2026-06-16 · Updated 2026-06-16 · CVE-2026-48781

Mitre

CVSS v3.1

9.9

Critical

Base vector

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

Postiz is an AI social media scheduling tool. In versions prior to 2.21.8, the Skool integration callback signed an attacker-controlled JSON blob into a session-shape JWT using the application's JWT SECRET, and the auth middleware trusted every claim in that JWT without re-resolving the user from the database. Any authenticated Postiz user could forge a SUPERADMIN session and impersonate arbitrary organizations. This allowed Full Access to the following: all parts of Postiz, including users registered to the specific instance and the ability to post in the name of the victim's social media channels added to that Postiz instance. This issue has been fixed in version 2.21.8.

Fix

Insufficient Verification of Data Authenticity

Incorrect Authorization

Weakness Enumeration

CWE-345

CWE-302

CWE-863

Related Identifiers

CVE-2026-48781

Affected Products

Postiz-App

References · 4

• https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-j77w-h625-56q2 · Note
• https://github.com/gitroomhq/postiz-app/commit/23696d2973510ae1f3f48bfa41a6bfbbf9827b05 · Note
• https://gadvisory.org/advisories/PSA-2026-2CAQ96 · Note
• http://github.com/gitroomhq/postiz-app/releases/tag/v2.21.8 · Note