{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-53608: @apostrophecms/seo Vulnerable to Stored XSS via Unsanitized Google Analytics / GTM ID Injected into Script Tag","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-53608","status":"final","version":"1","initial_release_date":"2026-06-12T20:57:48.913Z","current_release_date":"2026-06-15T17:49:39.197Z","revision_history":[{"date":"2026-06-12T20:57:48.913Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"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.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-53608 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-53608"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-53608"},{"category":"external","summary":"https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-wf43-fpp3-cf65","url":"https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-wf43-fpp3-cf65"}]},"product_tree":{"branches":[{"category":"vendor","name":"apostrophecms","branches":[{"category":"product_name","name":"@apostrophecms/seo","branches":[{"category":"product_version","name":"<= 1.4.2","product":{"name":"apostrophecms @apostrophecms/seo <= 1.4.2","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:apostrophecms:\\@apostrophecms\\/seo:\\<\\=_1.4.2:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-53608","title":"@apostrophecms/seo Vulnerable to Stored XSS via Unsanitized Google Analytics / GTM ID Injected into Script Tag","notes":[{"category":"description","text":"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.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"]},"scores":[{"cvss_v3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","baseScore":8.7,"baseSeverity":"HIGH"},"products":["CSAFPID-1"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1"]}]}]}