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CVE-2026-115933— Forged signed tokens let any registered user take over other users and organizations

Quick assessment

Affected
GitroomHQ postiz-app
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Postiz 使用同一个共享密钥对会话令牌、邀请令牌和密码重置令牌进行签名，且未在令牌中包含任何标识其用途的标记。某一路径在刷新浏览器扩展通道的凭证时，直接对请求中携带的已签名数据进行重新签名，并将结果存储到请求用户可读取的位置。因此，攻击者可以获取一个包含任意自定义声明的有效签名令牌，而应用程序会将该令牌误认为是有效的会话令牌、带有指定角色的组织邀请令牌、密码重置令牌或企业配置令牌。 此外，另一条范围较窄的创建团队邀请的路径，也以相同方式对请求体中的额外字段进行签名。

CVSS 9.9 · Critical
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I. Basic Information for CVE-2026-115933

Vulnerability Information
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Vulnerability Title
Forged signed tokens let any registered user take over other users and organizations
Source: CVE Program / CVE List V5
Vulnerability Description
Postiz signs its session, invitation and password reset tokens with one shared secret and without any marker of what a token is for. A route that refreshes the credentials of a browser-extension channel signed data taken from the request itself and stored the result where the requesting user can read it back. A user could therefore obtain a validly signed token containing any claims they choose, which the application accepts as a session, as an organization invitation with a chosen role, as a password reset or as an enterprise provisioning token. A second, narrower route that creates team invitations signs extra fields from the request body in the same way.
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
使用欺骗进行的认证绕过
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
GitroomHQ postiz-app 2.15.0 ~ 2.25.3 -

II. Public POCs for CVE-2026-115933

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-115933

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Other References for CVE-2026-115933 (1)

Other References for CVE-2026-115933 (3)

IV. Related Vulnerabilities

Same product: postiz-app
Same vendor: GitroomHQ
Same weakness: CWE-290

V. Comments for CVE-2026-115933

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