CVE-2026-113671 ApostropheCMS: Host header controls server-side image fetch origin in @apostrophecms/ai-helper, enabling authenticated SSRF
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-113671?
CVE-2026-113671 is a medium-severity vulnerability in @apostrophecms ai-helper, published on 20 Oct 2026.
Official 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.
Weakness: CWE-918
Which versions are affected by CVE-2026-113671?
2 open source packages ship an affected version, including @apostrophecms/ai-helper.
| Package | Affected | Fixed in |
|---|---|---|
@apostrophecms/ai-helper npm | From 1.0.0-beta.10 | 1.0.0-beta.13 |
@apostrophecms/ai-helper npm | From 1.0.0-beta.10 | 1.0.0-beta.13 |
How do I fix CVE-2026-113671?
Upgrade @apostrophecms/ai-helper to 1.0.0-beta.13 or later.
Is CVE-2026-113671 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-113671 exists.
Sources
Also known as GHSA-527g-ff96-x6wj.