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

Status: published. Published: 2026-10-23. Updated: 2026-11-02.

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.

## Remediation

- workaround: 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. (source: CNA: postiz)
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: postiz) — https://github.com/gitroomhq/postiz-app/commit/9383f5be4d310c346e33a3748a9a7ded64c96fed

## Affected products and versions

- GitroomHQ / postiz-app (postiz-app): ≥ 2.23.0; < 2.25.2 (affected, semver). Source: CNA: postiz

## Severity and prioritization

- CVSS 3.1: 9.9 (critical); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H; source: CNA: postiz

- CVSS 3.1: 9.9 (critical); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H; source: NVD: 4cdc9741-f887-419a-a2fd-acbbd2729276

- CISA KEV: No listing in collected sources

- EPSS: 0.48% as of 2026-11-02; percentile 41.73%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-470, CWE-73

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/gitroomhq/postiz-app (CNA: postiz; product)

- https://github.com/gitroomhq/postiz-app/releases/tag/v2.25.2 (CNA: postiz; release-notes)

- https://github.com/gitroomhq/postiz-app/commit/9383f5be4d310c346e33a3748a9a7ded64c96fed (CNA: postiz; patch)

- https://gadvisory.org/advisories/PSA-2026-JNXM56 (CNA: postiz; vendor-advisory)

- https://gadvisory.org/advisories/PSA-2026-JNXM56 (4cdc9741-f887-419a-a2fd-acbbd2729276)

- https://github.com/gitroomhq/postiz-app (4cdc9741-f887-419a-a2fd-acbbd2729276)

- https://github.com/gitroomhq/postiz-app/commit/9383f5be4d310c346e33a3748a9a7ded64c96fed (4cdc9741-f887-419a-a2fd-acbbd2729276)

- https://github.com/gitroomhq/postiz-app/releases/tag/v2.25.2 (4cdc9741-f887-419a-a2fd-acbbd2729276)

## Provenance

- CNA: postiz: https://www.cve.org/CVERecord?id=CVE-2026-115931; retrieved 2026-11-02; source updated 2026-11-02

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-115931; retrieved 2026-11-02; source updated 2026-11-02

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-115931; retrieved 2026-11-02; source updated Not reported

Revision: b5c8871ab38768a173c51b02eaa312dd91fa0cd5310180251be2f85e2a9f4ab5

Canonical: https://y2.dev/cve/CVE-2026-115931

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