What’s Vulnerable › Vulnerabilities

CVE-2019-19903

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-12-19 · updated 2026-06-17
• Weakness: CWE-79

Description

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: from 1.13.0 before 1.13.5; from 1.14.0 before 1.14.2 — fixed in 1.13.5, 1.14.2

How to fix

Upgrade to a fixed version: BackdropCMS Backdrop 1.13.5, 1.14.2. Check the vendor advisory for mitigations.

References

• https://backdropcms.org/security/backdrop-sa-core-2019-015
• https://backdropcms.org/security/backdrop-sa-core-2019-015

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