XSS in Apostrophecms Apostrophe
CVE-2026-45011
ApostropheCMS is an open-source Node.js content management system. Version 4.29.0 has a stored cross-site scripting vulnerability in the image widget functionality. A user with the Editor role can configure an image widget link to use a javascript: URL payload. Because editors have permission to publish pages, the malicious widget can be published to the live site. When another user, including an administrator or public visitor, clicks the affected image/link, arbitrary JavaScript executes in the victim’s browser. As of time of publication, no known patched versions are available.
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.002 (11.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N.
Affected products
- Apostrophecms Apostrophe — versions = 4.29.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_CONFIRM)
Frequently asked questions
- What is CVE-2026-45011?
- CVE-2026-45011 is a high-severity vulnerability in Apostrophecms Apostrophe, classified under Cross-site Scripting. CVSS score: 7.3/10. Published 2026-06-12.
- How severe is CVE-2026-45011?
- High severity. CVSS v3 base score is 7.3 out of 10.