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CVE-2026-48781— Postiz has cross-tenant SUPERADMIN takeover via Skool-provider JWT forgery

Quick assessment

Affected
gitroomhq postiz-app
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

gitroomhq postiz-app是gitroomhq的社交媒体内容规划与发布平台。 Gitroom Postiz-App 2.21.8之前版本存在授权问题漏洞，该漏洞源于Skool使用了不正确的授权机制，将攻击者控制的JSON blob签入JWT，可能导致经过身份验证的Postiz用户伪造SUPERADMIN会话并冒充任意组织，从而完全访问Postiz。

CVSS 9.9 · Critical EPSS 0.28% · P19

Affected Version Matrix 1

VendorProduct Version RangeStatus
gitroomhq postiz-app < 2.21.8 affected
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I. Basic Information for CVE-2026-48781

Vulnerability Information
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Vulnerability Title
Postiz has cross-tenant SUPERADMIN takeover via Skool-provider JWT forgery
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用假设不可变数据进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
Gitroom Postiz-App 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
gitroomhq postiz-app是gitroomhq的社交媒体内容规划与发布平台。 Gitroom Postiz-App 2.21.8之前版本存在授权问题漏洞，该漏洞源于Skool使用了不正确的授权机制，将攻击者控制的JSON blob签入JWT，可能导致经过身份验证的Postiz用户伪造SUPERADMIN会话并冒充任意组织，从而完全访问Postiz。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
gitroomhq postiz-app < 2.21.8 -

II. Public POCs for CVE-2026-48781

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9215 chars
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III. Intelligence Information for CVE-2026-48781

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Patches & Fixes for CVE-2026-48781 (1)

Vendor Advisories for CVE-2026-48781 (2)

IV. Related Vulnerabilities

Same product: postiz-app
Same vendor: gitroomhq
Same weakness: CWE-302

V. Comments for CVE-2026-48781

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