What is CVE-2026-53608?

CVE-2026-53608 is a high-severity vulnerability in Apostrophecms @Apostrophecms/seo, classified under Cross-site Scripting. CVSS score: 8.7/10. Published 2026-06-12.

How severe is CVE-2026-53608?

High severity. CVSS v3 base score is 8.7 out of 10.

XSS in Apostrophecms @Apostrophecms/seo

CVE-2026-53608

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 (`seoGoogl…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (11.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N.

Affected products

Apostrophecms @Apostrophecms/seo — versions <= 1.4.2

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-53608?: CVE-2026-53608 is a high-severity vulnerability in Apostrophecms @Apostrophecms/seo, classified under Cross-site Scripting. CVSS score: 8.7/10. Published 2026-06-12.
How severe is CVE-2026-53608?: High severity. CVSS v3 base score is 8.7 out of 10.