CVE-2026-48781

CRITICAL EPSS 11.1%
Published Jun 17, 20262w ago · Modified Jun 18, 20261w ago
9.9 CVSS 3.1
Critical
Find Similar
Published Jun 17, 2026 2w ago
Last Modified Jun 18, 2026 1w ago

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.

CVSS Details

Base Score
9.9
Exploitability
3.1
Impact
6.0
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Changed
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
11.1% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 3

CWE-302
CWE-345
CWE-863 Incorrect Authorization Authorization

References 4

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

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.