gitroomhq postiz-app up to 2.21.7 authentication bypass by assumed-immutable data

Summaryinfo

A vulnerability marked as critical has been reported in gitroomhq postiz-app up to 2.21.7. This affects an unknown part. Performing a manipulation results in authentication bypass by assumed-immutable data. This vulnerability is identified as CVE-2026-48781. The attack can be initiated remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in gitroomhq postiz-app up to 2.21.7. It has been classified as critical. This affects an unknown code. The manipulation with an unknown input leads to a authentication bypass by assumed-immutable data vulnerability. CWE is classifying the issue as CWE-302. The authentication scheme or implementation uses key data elements that are assumed to be immutable, but can be controlled or modified by the attacker. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-48781 since 05/22/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 2.21.8 eliminates this vulnerability.

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Productinfo

Vendor

• gitroomhq

Name

• postiz-app

Version

• 2.21.0
• 2.21.1
• 2.21.2
• 2.21.3
• 2.21.4
• 2.21.5
• 2.21.6
• 2.21.7

Website

• Product: https://github.com/gitroomhq/postiz-app/

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