CVE-2026-115931: Arbitrary file read and backend crash through unrestricted provider method calls

Vulnerability summary

CVE-2026-115931 is a critical (CVSS 9.9) External Control of File Name or Path vulnerability in gitroomhq postiz-app.

Timeline

1. 23-10-2026
   PublishedVulnerability first disclosed.
2. 23-10-2026
   Last modifiedVulnerability information updated.

Description

Postiz lets a signed-in user ask the backend to run a function on one of their connected channels. The backend did not restrict which functions can be requested, so a user could call internal helper functions that were never meant to be reachable from the web interface. One of those helpers reads a file from the server's disk. A user who connects a channel whose stored token is a file path can have the backend return the contents of any file it can read, including its environment, which holds the secret used to sign login sessions, the database address and the credentials of connected services. Another helper makes the backend process exit with a single request. Self-registration is open by default, so no existing account and no action by another user is needed.

• CWE-73External Control of File Name or PathThe product allows user input to control or influence paths or file names that are used in filesystem operations.
• CWE-470Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')The product uses external input with reflection to select which classes or code to use, but it does not sufficiently prevent the input from selecting improper classes or code.