What’s Vulnerable › Vulnerabilities

CVE-2019-19901

• 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 1.13.x before 1.13.5 and 1.14.x before 1.14.2. It doesn't sufficiently filter output when displaying certain block descriptions created by administrators. An attacker could potentially craft a specialized description, then have an administrator execute scripting when configuring a layout, aka XSS. This issue is mitigated by the fact that the attacker would be required to have the permission to create custom blocks, which is typically an administrative task.

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-2019-013
• https://backdropcms.org/security/backdrop-sa-core-2019-013

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