CVEvulnerability

CVE-2026-48781

9.9 CRITICAL Published 2026-06-17 Modified 2026-10-26 Official page ↗
Status
Deferred
Published
2026-06-17
Last modified
2026-10-26
Assigner
[email protected]
CVSS 3.1 ([email protected])
9.9 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weaknesses
CWE-302, CWE-345, CWE-863

Description

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.

Related

Weakness · CWE (3)

  • CWE-302 Authentication Bypass by Assumed-Immutable Data weakness
  • CWE-345 Insufficient Verification of Data Authenticity weakness
  • CWE-863 Incorrect Authorization weakness

References