Description
ApostropheCMS is an open-source Node.js content management system. From 1.0.0-beta.10 until 1.0.0-beta.13 of the AI helper, an editor with image-generation capability can create a base64-generated image record without a stored provider URL and invoke image acceptance on a deployment using local relative storage with no trusted global base URL. The server resolves the fixed uploads path against a request-controlled Host-derived origin, enabling bounded server-side requests to an attacker-selected host, port, and HTTP origin, but not arbitrary-path retrieval or the stored-provider and absolute-storage configurations. This issue is fixed in AI helper 1.0.0-beta.13.
References5
- github.com/apostrophecms/apostrophe/commit/9500b8b0e1d630d5e07f…
- github.com/apostrophecms/apostrophe/commit/f84fd41cbf6c22eb8d00…
- github.com/apostrophecms/apostrophe/releases/tag/@apostrophecms…
- github.com/apostrophecms/apostrophe/security/advisories/GHSA-52…
- github.com/apostrophecms/apostrophe/security/advisories/GHSA-52…
Metrics
- CVSS 3.1
-
4.3
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N - EPSS — exploit probability
- 0% percentile: 26 · as of 9 November 2026
- CWE
- CWE-918
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.