What is CVE-2026-35569?

CVE-2026-35569 is a high-severity vulnerability in Apostrophecms Apostrophe, classified under Cross-site Scripting. CVSS score: 8.7/10. Published 2026-04-15.

How severe is CVE-2026-35569?

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

XSS in Apostrophecms Apostrophe

CVE-2026-35569

ApostropheCMS is an open-source Node.js content management system. Versions 4.28.0 and prior contain a stored cross-site scripting vulnerability in SEO-related fields (SEO Title and Meta Description), where user-controlled input is rendere…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.003 (22.0th 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 Apostrophe — versions < 4.29.0
Apostrophecms

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Patch, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-35569?: CVE-2026-35569 is a high-severity vulnerability in Apostrophecms Apostrophe, classified under Cross-site Scripting. CVSS score: 8.7/10. Published 2026-04-15.
How severe is CVE-2026-35569?: High severity. CVSS v3 base score is 8.7 out of 10.