CVE-2026-48781 Details
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.
A vulnerability exists in Postiz, an AI social media scheduling tool, in versions prior to 2.21.8. The issue arises within the Skool integration, where an attacker can manipulate a JSON blob that is then signed into a session-shaped JWT using the application's JWT_SECRET. The authentication middleware accepts all claims in this JWT without verifying the user against the database. As a result, any authenticated Postiz user can create a SUPERADMIN session and impersonate any organization, gaining full access to all Postiz features, including user management and posting on behalf of the victim's social media accounts linked to their Postiz instance.
Users are advised to upgrade to Postiz version 2.21.8 or later.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jun 17, 2026CISA-ADP
Assessed Jun 18, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| http://github.com/gitroomhq/postiz-app/releases/tag/v2.21.8 | [email protected] | Release NotesVendor |
| https://gadvisory.org/advisories/PSA-2026-2CAQ96 | [email protected] | Advisory |
| https://github.com/gitroomhq/postiz-app/commit/23696d2973510ae1f3f48bfa41a6bfbbf9827b05 | [email protected] | Source CodeVendor |
| https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-j77w-h625-56q2 | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-302 | Authentication Bypass by Assumed-Immutable Data | [email protected] |
| CWE-345 | Insufficient Verification of Data Authenticity | [email protected] |
| CWE-863 | Incorrect Authorization | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Postiz | >= 0 |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 18, 2026 | CVE Modified | CISA-ADP |
| Jun 17, 2026 | New CVE Received | [email protected] |