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TI-2026-36051 Aliases CVE-2026-48781

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

Priority MEDIUM 42CWE-302Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-345.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00209 11th percentileScored 2026-11-07
Fix Fixed postiz-app (gitroomhq): 2.21.8

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
gitroomhqpostiz-appbefore 2.21.82.21.8Patch availableCNA
  • postiz-app Vendorgitroomhq Affected before 2.21.8 Fixed in 2.21.8 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:gitroom:postiz:*:*:*:*:*:*:*:*——gitroomhq
  • cpe:2.3:a:gitroom:postiz:*:*:*:*:*:*:*:* Versions — — ·gitroomhq

Remediation

  • Fix · CNA postiz-app (gitroomhq) Fixed in 2.21.8

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-48781

References

Other 4

  • TI-2026-26825 Postiz: Unauthenticated Full-Read SSRF via /public/stream Endpoint with Trivially Bypassable Extension Check CVSS 3.1HIGH 8.6
  • TI-2026-28982 Postiz has Server-Side Request Forgery via Redirect Bypass in /api/public/stream CVSS 3.1HIGH 8.2
  • TI-2026-29238 Postiz Has Unrestricted File Upload via MIME Type Spoofing that Leads to Stored XSS CVSS 3.1CRITICAL 9.0
  • TI-2026-26824 Postiz: SSRF in upload-from-url endpoint allows fetching internal resources and cloud metadata CVSS 4.0HIGH 8.3
  • TI-2026-26837 Postiz: SSRF via Webhook Creation Endpoint Missing URL Safety Validation CVSS 3.1MEDIUM 5.4
  • TI-2026-15715 Unauthenticated arbitrary file read via /uploads path traversal (URL-encoded separators) leading to instance takeover CVSS 4.0CRITICAL 9.3
See all 19 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences