CVE-2019-19903: Backdropcms Backdrop CMS

Medium severity, CVSS 4.8. EPSS: 0.6% chance of exploitation in the next 30 days.

An issue was discovered in Backdrop CMS 1.14.x before 1.14.2. It doesn't sufficiently filter output when displaying file type descriptions created by administrators. An attacker could potentially craft a specialized description, then have an administrator execute scripting when viewing the list of file types, aka XSS. This vulnerability is mitigated by the fact that an attacker must have a role with the "Administer file types" permission.

Affected products

• Backdropcms Backdrop CMS: from 1.13.0, before 1.13.5 (fixed in 1.13.5); from 1.14.0, before 1.14.2 (fixed in 1.14.2)

Published 2019-12-19. Last modified 2026-06-17.