CVE-2026-48781: CWE-302: Authentication Bypass by Assumed-Immutable Data in gitroomhq postiz-app
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.
AI Analysis
Technical Summary
CVE-2026-48781 is an authentication bypass vulnerability in gitroomhq's postiz-app prior to version 2.21.8. The flaw arises because the Skool integration callback signs attacker-controlled JSON blobs into session-shaped JWTs using the application's JWT_SECRET. The authentication middleware then trusts all claims in these JWTs without re-resolving the user from the database, allowing any authenticated user to forge a SUPERADMIN session. This results in full administrative access, including impersonation of arbitrary organizations and posting on their social media channels. The vulnerability is addressed in version 2.21.8.
Potential Impact
An attacker with any authenticated Postiz user account can escalate privileges to SUPERADMIN, gaining full access to all application features and user data within the instance. This includes the ability to impersonate organizations and post content on their behalf to connected social media channels. The compromise affects confidentiality, integrity, and availability of the affected Postiz instance.
Mitigation Recommendations
A fix is available in postiz-app version 2.21.8. Users should upgrade to version 2.21.8 or later to remediate this vulnerability. No other mitigation is indicated by the vendor advisory.
CVE-2026-48781: CWE-302: Authentication Bypass by Assumed-Immutable Data in gitroomhq postiz-app
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 v3.1
Score 9.9critical
Affected software
pkg:github/gitroomhq/postiz-appRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-48781 is an authentication bypass vulnerability in gitroomhq's postiz-app prior to version 2.21.8. The flaw arises because the Skool integration callback signs attacker-controlled JSON blobs into session-shaped JWTs using the application's JWT_SECRET. The authentication middleware then trusts all claims in these JWTs without re-resolving the user from the database, allowing any authenticated user to forge a SUPERADMIN session. This results in full administrative access, including impersonation of arbitrary organizations and posting on their social media channels. The vulnerability is addressed in version 2.21.8.
Potential Impact
An attacker with any authenticated Postiz user account can escalate privileges to SUPERADMIN, gaining full access to all application features and user data within the instance. This includes the ability to impersonate organizations and post content on their behalf to connected social media channels. The compromise affects confidentiality, integrity, and availability of the affected Postiz instance.
Mitigation Recommendations
A fix is available in postiz-app version 2.21.8. Users should upgrade to version 2.21.8 or later to remediate this vulnerability. No other mitigation is indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-22T20:18:20.365Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a31c7a50b89be6888375e45
Added to database: 06/16/2026, 22:01:09 UTC
Last enriched: 06/24/2026, 15:49:17 UTC
Last updated: 08/01/2026, 07:18:00 UTC
Views: 113
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