CVE-2026-48781 Postiz has cross-tenant SUPERADMIN takeover via Skool-provider JWT forgery
Authenticated users can forge JWTs to gain SUPERADMIN access and impersonate other organizations in Postiz.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-48781?
CVE-2026-48781 is a critical authentication bypass vulnerability in gitroomhq postiz-app, published on 16 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-48781?
How do I fix CVE-2026-48781?
No fix has been published for CVE-2026-48781 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-48781 being exploited?
There is no known exploitation of CVE-2026-48781 in the wild and no public exploit code.
Sources
Also known as GHSA-j77w-h625-56q2.