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TI-2026-38664 Aliases CVE-2026-53608GHSA-wf43-fpp3-cf65

@apostrophecms/seo Vulnerable to Stored XSS via Unsanitized Google Analytics / GTM ID Injected into Script Tag

Priority HIGH 73CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

ApostropheCMS is an open-source Node.js content management system. Versions up to and including 1.4.2 of the `@apostrophecms/seo` package injects the Google Analytics Tracking ID (`seoGoogleTrackingId`) and Google Tag Manager ID (`seoGoogleTagManager`) directly into `<script>` tag bodies using JavaScript template literals without any sanitization or validation. Any user with editor-level access (the default role for content managers) can set these fields to a malicious value, resulting in stored XSS that executes on every page for every visitor of the site. As of time of publication, no known patched versions are available.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00256 17th percentileScored 2026-11-07
Fix Fixed @apostrophecms/seo (npm): 1.5.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
apostrophecms@apostrophecms/seoup to 1.4.2—No fix listedCNA
—@apostrophecms/seo (npm)before 1.5.01.5.0Patch availableGHSA-wf43-fpp3-cf65
  • @apostrophecms/seo Vendorapostrophecms Affected up to 1.4.2 Fixed in — No fix listed CNA
  • @apostrophecms/seo (npm) Vendor— Affected before 1.5.0 Fixed in 1.5.0 Patch available GHSA-wf43-fpp3-cf65

Remediation

  • Fix · GHSA-wf43-fpp3-cf65 @apostrophecms/seo (npm) Fixed in 1.5.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-53608
  2. 2026-10-03 Alias added: GHSA-wf43-fpp3-cf65

References

Advisory 1

Other 4

  • TI-2026-25223 ApostropheCMS has Arbitrary File Write (Zip Slip / Path Traversal) in Import-Export Gzip Extraction CVSS 3.1CRITICAL 10.0
  • TI-2026-32848 Apostrophe has default XSS via `xmp` raw-text passthrough in `sanitize-html` CVSS 3.1CRITICAL 9.3
  • TI-2026-27673 ApostropheCMS: Stored XSS in SEO Fields Leads to Authenticated API Data Exposure in ApostropheCMS CVSS 3.1HIGH 8.7
  • TI-2026-76992 Unauthenticated resource exhaustion via ApostropheCMS import routes CVSS 3.1HIGH 7.5
  • TI-2026-76974 ApostropheCMS leaves rejected CSV uploads in temporary directory CVSS 3.1HIGH 7.5
  • TI-2026-38665 Prototype pollution in apostrophecms apostrophe CVSS 3.1CRITICAL 9.1
See all 65 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences