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: 0.000 (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 Apostrophe — versions < 4.29.0
- Apostrophecms
Weakness classification (CWE)
References
- https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-855c-r2vq-c292 (x_refsource_CONFIRM, Exploit, Patch, Vendor Advisory)
- https://github.com/apostrophecms/apostrophe/commit/0e57dd07a56ae1ba1e3af646ba026db4d0ab5bb3 (Patch, x_refsource_MISC)
- https://github.com/Chittu13/cve-research/tree/main/CVE-2026-35569 (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.