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@apostrophecms/ai-helper

Open actionable advisories and recorded vendor fixes. This public package view has no inventory attached and cannot establish whether your deployment is affected. A vendor fix never resolves your finding; verify your installed version and the source guidance.

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1 actionable advisory, newest first. Withdrawn advisories and news are excluded. Coverage is partial.

  1. Medium, CVSS 4.3npmAmendedPublished

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

    CVE-2026-113671 · GHSA-527g-ff96-x6wj

    Affected
    • npm @apostrophecms/ai-helper >= 1.0.0-beta.10, < 1.0.0-beta.13
    Fixed in
    1.0.0-beta.13· Vendor fix available
    Issue
    The @apostrophecms/ai-helper package builds the URL for a server-side image fetch by resolving a storage-relative path against req.baseUrl. When the site does not set a global base URL (the default), req.baseUrl is derived from the incoming HTTP Host header. An authenticated editor can generate a base64 AI image (which is persisted without a stored url) and then send an unauthorized PATCH accept request with an attacker-chosen Host header. The server then issues an outbound GET to the attacker-selected origin, producing a Server-Side Request Forgery primitive that reaches hosts and ports the client cannot otherwise contact. The affected code lives in packages/ai-helper/modules/@apostrophecms/ai-helper-image/index.js. Root Cause The image accept route trusts req.baseUrl as a safe origin for constructing an internal fetch target, but req.baseUrl is attacker-influenced whenever the site has no configured base URL. The URL builder concatenates a default local storage path (which…

    Recommended action: Upgrade to 1.0.0-beta.13 (pre-release) or later, then redeploy and verify.A vendor fix does not resolve your finding until you verify it in your own systems.

    Sources:github.com (1)osv.dev (2)Source checked Evidence →