CVE-2021-25978: Apostrophecms

Medium severity, CVSS 5.4. EPSS: 0.5% chance of exploitation in the next 30 days.

Apostrophe CMS versions between 2.63.0 to 3.3.1 are vulnerable to Stored XSS where an editor uploads an SVG file that contains malicious JavaScript onto the Images module, which triggers XSS once viewed.

Affected products

• Apostrophecms Apostrophecms: from 2.63.0, up to and including 3.3.1

Published 2021-11-07. Last modified 2026-06-17.