Arbitrary file read and backend crash through unrestricted provider method calls
Summary
| CVE | CVE-2026-115931 |
|---|---|
| State | PUBLISHED |
| Assigner | postiz |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-10-23 23:17:43 UTC |
| Updated | 2026-10-23 23:17:43 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 9.9 CRITICAL from 4cdc9741-f887-419a-a2fd-acbbd2729276
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Problem Types: CWE-73 | CWE-470 | CWE-470 CWE-470 | CWE-73 CWE-73
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | 4cdc9741-f887-419a-a2fd-acbbd2729276 | Secondary | 9.9 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
| 3.1 | CNA | CVSS | 9.9 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | GitroomHQ | Postiz-app | affected 2.23.0 2.25.2 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| github.com/gitroomhq/postiz-app | 4cdc9741-f887-419a-a2fd-acbbd2729276 | github.com | |
| github.com/gitroomhq/postiz-app/commit/9383f5be4d310c346e33a3748a9a7ded6... | 4cdc9741-f887-419a-a2fd-acbbd2729276 | github.com | |
| github.com/gitroomhq/postiz-app/releases/tag/v2.25.1 | 4cdc9741-f887-419a-a2fd-acbbd2729276 | github.com | |
| gadvisory.org/advisories/PSA-2026-JNXM56 | 4cdc9741-f887-419a-a2fd-acbbd2729276 | gadvisory.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Anthropic, PBC (en)
CNA: Enno Gelhaus (en)
CNA: Nevo David (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-10-23T19:45:00.000Z | Anthropic has disclosed a thorough report of this vulnerability including a working PoC to Postiz |
| CNA | 2026-10-23T20:00:00.000Z | Postiz has reproduced the vulnerability and is working on a fix |
| CNA | 2026-10-23T21:33:00.000Z | Postiz has pushed a fix for this vulnerability and verified it |
| CNA | 2026-10-23T22:00:00.000Z | Postiz has created a release and published the advisory |
Workarounds
CNA: Set DISABLE_REGISTRATION=true. The attacker needs an ordinary account, so closing self-registration limits exposure to people who already hold one. This reduces reach, it does not close the issue.
Exploits
CNA: Exploitation was demonstrated end to end against an unmodified build of Postiz at commit 3a7d28b7ad96, using only a self-registered account: the contents of a file placed outside the application's directories and the exact JWT secret the backend was started with were both returned in full. Terminating the backend with one request was demonstrated separately.