CVE-2026-48781: critical vulnerability in gitroomhq postiz-app
Postiz has cross-tenant SUPERADMIN takeover via Skool-provider JWT forgery
Published · Updated
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28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.9epss 0.2%
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:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Affected products
gitroomhq · postiz-appRelated CVEs — gitroomhq postiz-app
In the same product, most dangerous first.
CVE-2026-19264CRITICALUnauthenticated arbitrary file read via /uploads path traversal (URL-encoded separators) leading to instance takeoverEPSS 1.0%CVE-2026-42298CRITICALPostiz: Arbitrary Code Execution and Token Exfiltration in pr-docker-build.yml via untrusted Dockerfile.devEPSS 0.5%CVE-2026-34577HIGHPostiz: Unauthenticated Full-Read SSRF via /public/stream Endpoint with Trivially Bypassable Extension CheckEPSS 0.5%CVE-2026-40168HIGHPostiz has Server-Side Request Forgery via Redirect Bypass in /api/public/streamEPSS 0.4%CVE-2025-53641HIGHPostiz allows header mutation in middleware facilitates resulting in SSRFEPSS 0.3%CVE-2026-34576HIGHPostiz: SSRF in upload-from-url endpoint allows fetching internal resources and cloud metadataEPSS 0.3%