What’s Vulnerable › Vulnerabilities

CVE-2026-53608: @apostrophecms/seo Vulnerable to Stored XSS via Unsanitized Google Analytics / GTM ID Injected into Script Tag

• Severity: high (CVSS 8.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-12 · updated 2026-10-25
• Weakness: CWE-79

Description

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.

Affected products

• apostrophecms @apostrophecms/seo: through 1.4.2

References

• https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-wf43-fpp3-cf65
• https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-wf43-fpp3-cf65

Get alerted when CVE-2026-53608 or the next vulnerability affects your stack