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CVE-2026-48781

CRITICAL
9.9
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-48781
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-05-22 20:18 UTC
Published
2026-06-16 21:31 UTC
Last updated
2026-06-18 14:26 UTC
Primary CWE
CWE-302
CWE-302: Authentication Bypass by Assumed-Immutable Data
Vendor / Product
gitroomhq / postiz-app
Sources
cve.org  ·  NVD

Severity & Metrics

9.9 CRITICAL CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
SSVC — CISA Coordinator
Exploitation
none
Automatable
no
Tech. Impact
total
Affected products (1)
VendorProductPlatformVersions
gitroomhq postiz-app — < 2.21.8
Weakness (CWE)
CWESourceDescription
CWE-302 cna CWE-302: Authentication Bypass by Assumed-Immutable Data
CWE-345 cna CWE-345: Insufficient Verification of Data Authenticity
CWE-863 cna CWE-863: Incorrect Authorization
CVSS scores (1)
ScoreSeverityVersionSourceVector
9.9 CRITICAL 3.1 cna CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
References (4)
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