Cross-site scripting in Backdrop CMS - CVE-2019-19903
Published: December 19, 2019 / Updated: July 17, 2020
Vulnerability identifier: #VU30512
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2019-19903
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote privileged user to read and manipulate data.
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 software
Backdrop CMS
How to mitigate CVE-2019-19903
Install update from vendor's website.
Backdrop CMS - update to 1.14.2