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CVE-2026-113671

CVE-2026-113671 · ApostropheCMS: Host header controls server-side image fetch origin in @apostrophecms/ai-helper, enabling authenticated SSRF

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 4.3 · Medium · EPSS 0.3% · Public exploit · Fix available

Published
Updated

Stack: node

Affected products and versions

  • apostrophe

    Versions
    • >= 4.25.0, < 4.33.0: Affected

    No fix published

  • ai-helper

    Versions
    • >= 1.0.0-beta.10, < 1.0.0-beta.13: Affected

    No fix published

  • @apostrophecms/ai-helper npm

    Affected ranges
    • SEMVER: ≥ 1.0.0-beta.10, < 1.0.0-beta.13

    Update to 1.0.0-beta.13

Original sources

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