CVE-2026-113671
ApostropheCMS: Host header controls server-side image fetch origin in @apostrophecms/ai-helper, enabling authenticated SSRF
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.
- Affected
- apostrophecms · @apostrophecms · apostrophe · ai-helper
- CVSS v3.1 GITHUB
- 4.3 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N - EPSS
- 0.33% chance of exploitation in the next 30 days, 26th percentile
- Published
- 2026-10-20
Proof-of-concept exploits (1)
CVE references
- apostrophecms/apostrophe/commit/9500b8b0e1d630d5e07fbb5fd2c25ed0943845ceREFERENCE
- apostrophecms/apostrophe/commit/f84fd41cbf6c22eb8d0008fc9c25df1f7130b350REFERENCE
- apostrophecms/apostrophe/releases/tag/@apostrophecms/ai-helper@1.0.0-beta.13REFERENCE
- apostrophecms/apostrophe/security/advisories/GHSA-527g-ff96-x6wjREFERENCE