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  4. CVE 2026 113671 apostrophecms host header controls server side
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Back to active CVEs
Medium · CVSS 4.3CVE-2026-113671GHSA-527G-FF96-X6WJ

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

Answer in brief

CVE-2026-113671 records a Medium severity (CVSS 4.3) vulnerability in ApostropheCMS: Host header controls server-side image fetch origin in @apostrophecms/ai-helper, enabling authenticated SSRF. The current sources do not mark it as known exploited. The current feed maps @apostrophecms/ai-helper (generic), apostrophecms/apostrophe (generic), @apostrophecms/ai-helper (npm). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 20, 2026Updated Oct 20, 2026Source checked Oct 20, 2026First seen by HOL Oct 20, 2026Material review Oct 20, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 4.3
Exploitation
Not marked as known exploited
Affected software
3 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 4.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps @apostrophecms/ai-helper (generic), apostrophecms/apostrophe (generic), @apostrophecms/ai-helper (npm). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
@apostrophecms/ai-helpergeneric>=1.0.0-beta.10 <1.0.0-beta.131.0.0-beta.13
apostrophecms/apostrophegeneric>=4.25.0 <4.33.04.33.0
@apostrophecms/ai-helpernpm>=1.0.0-beta.10,<1.0.0-beta.131.0.0-beta.13

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for @apostrophecms/ai-helper, apostrophecms/apostrophe, @apostrophecms/ai-helper.
  2. 2Review the reported fix. Update @apostrophecms/ai-helper to 1.0.0-beta.13; apostrophecms/apostrophe to 4.33.0; @apostrophecms/ai-helper to 1.0.0-beta.13 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 20, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 20, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 20, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • ApostropheCMS: Import API bypasses publication roles for protected contentSame apostrophecms/apostrophe package
  • ApostropheCMS sanitize-html: unbounded recursion when re-sanitizing the fallback of a discarded iframe (stack overflow, nestingLimit not enforced)Same apostrophecms/apostrophe package
  • ApostropheCMS: Path traversal in uploadfsSame apostrophecms/apostrophe package
  • ApostropheCMS uploadfs Azure backend leaks account-level SAS token into every public attachment URL (sas: true)Same apostrophecms/apostrophe package
  • ApostropheCMS: The general public can access @apostrophecms/user objects via a relationship (viewRole is not applied to the general public)Same apostrophecms/apostrophe package
  • ApostropheCMS sanitize-html: nonTextTags discard region ends early on an implied close, letting <noscript> content renderSame apostrophecms/apostrophe package

Record context

Vulnerability class
SSRF
EPSS
Not reported
CWE IDs
CWE-918
Source
CVE List V5
Source checked
Oct 20, 2026
References
5 linked sources
Open source record