CVE-2026-48781: CWE-302: Authentication Bypass by Assumed-Immutable Data in gitroomhq postiz-app
Postiz, an AI social media scheduling tool by gitroomhq, contains a critical authentication bypass vulnerability (CVE-2026-48781) in versions prior to 2.21.8. The issue arises from the Skool integration callback signing attacker-controlled JSON data into a session JWT using the app's JWT_SECRET. The authentication middleware trusts all JWT claims without revalidating the user against the database, allowing any authenticated user to forge a SUPERADMIN session and impersonate organizations. This grants full access to all Postiz features, including posting on behalf of victim social media accounts. The vulnerability is fixed in version 2.21.8.
AI Analysis
Technical Summary
CVE-2026-48781 is an authentication bypass vulnerability in gitroomhq's postiz-app affecting versions before 2.21.8. The flaw occurs because the Skool integration callback signs a JSON blob controlled by an attacker into a session JWT using the application's JWT_SECRET. The authentication middleware then trusts all claims in this JWT without re-resolving the user from the database, enabling any authenticated user to forge a SUPERADMIN session. This allows impersonation of arbitrary organizations and full access to all Postiz functionalities, including posting as victim social media channels. The vulnerability has a CVSS 3.1 score of 9.9 (critical) and is fixed in version 2.21.8.
Potential Impact
An attacker with any authenticated Postiz user account can exploit this vulnerability to forge a SUPERADMIN session, gaining full administrative access. This includes the ability to impersonate any organization and post content on behalf of victim social media channels linked to the Postiz instance. The compromise affects confidentiality, integrity, and availability of the affected Postiz installation.
Mitigation Recommendations
Upgrade postiz-app to version 2.21.8 or later to apply the official fix for this vulnerability. Versions prior to 2.21.8 are vulnerable. No other mitigation or temporary workaround is provided in the available data.
CVE-2026-48781: CWE-302: Authentication Bypass by Assumed-Immutable Data in gitroomhq postiz-app
Description
Postiz, an AI social media scheduling tool by gitroomhq, contains a critical authentication bypass vulnerability (CVE-2026-48781) in versions prior to 2.21.8. The issue arises from the Skool integration callback signing attacker-controlled JSON data into a session JWT using the app's JWT_SECRET. The authentication middleware trusts all JWT claims without revalidating the user against the database, allowing any authenticated user to forge a SUPERADMIN session and impersonate organizations. This grants full access to all Postiz features, including posting on behalf of victim social media accounts. The vulnerability is 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 affecting versions before 2.21.8. The flaw occurs because the Skool integration callback signs a JSON blob controlled by an attacker into a session JWT using the application's JWT_SECRET. The authentication middleware then trusts all claims in this JWT without re-resolving the user from the database, enabling any authenticated user to forge a SUPERADMIN session. This allows impersonation of arbitrary organizations and full access to all Postiz functionalities, including posting as victim social media channels. The vulnerability has a CVSS 3.1 score of 9.9 (critical) and is fixed in version 2.21.8.
Potential Impact
An attacker with any authenticated Postiz user account can exploit this vulnerability to forge a SUPERADMIN session, gaining full administrative access. This includes the ability to impersonate any organization and post content on behalf of victim social media channels linked to the Postiz instance. The compromise affects confidentiality, integrity, and availability of the affected Postiz installation.
Mitigation Recommendations
Upgrade postiz-app to version 2.21.8 or later to apply the official fix for this vulnerability. Versions prior to 2.21.8 are vulnerable. No other mitigation or temporary workaround is provided in the available data.
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: 6/16/2026, 10:01:09 PM
Last enriched: 6/16/2026, 10:15:32 PM
Last updated: 6/17/2026, 5:39:37 AM
Views: 12
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