Postiz has cross-tenant SUPERADMIN takeover via Skool-provider JWT forgery

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Summary

CVECVE-2026-48781
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-17 13:20:43 UTC
Updated2026-06-17 16:18:00 UTC
DescriptionPostiz 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.

Risk And Classification

Primary CVSS: v3.1 9.9 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Problem Types: CWE-302 | CWE-345 | CWE-863 | CWE-302 CWE-302: Authentication Bypass by Assumed-Immutable Data | CWE-345 CWE-345: Insufficient Verification of Data Authenticity | CWE-863 CWE-863: Incorrect Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.9CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
3.1CNADECLARED9.9CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Gitroomhq Postiz-app affected < 2.21.8 Not specified

References

ReferenceSourceLinkTags
github.com/gitroomhq/postiz-app/releases/tag/v2.21.8 [email protected] github.com
gadvisory.org/advisories/PSA-2026-2CAQ96 [email protected] gadvisory.org
github.com/gitroomhq/postiz-app/commit/23696d2973510ae1f3f48bfa41a6bfbbf... [email protected] github.com
github.com/gitroomhq/postiz-app/security/advisories/GHSA-j77w-h625-56q2 [email protected] github.com
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