CVE-2021-31274

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-09-08 · updated 2026-06-17
Weakness: CWE-79

Description

In LibreNMS < 21.3.0, a stored XSS vulnerability was identified in the API Access page due to insufficient sanitization of the $api->description variable. As a result, arbitrary Javascript code can get executed.

Affected products

librenms: before 21.3.0 — fixed in 21.3.0

How to fix

Upgrade to a fixed version: librenms 21.3.0. Check the vendor advisory for mitigations.

References

https://community.librenms.org/t/vulnerability-report-cross-site-scripting-xss-in-the-api-access-page/15431
https://github.com/librenms/librenms
https://github.com/librenms/librenms/pull/12739
https://community.librenms.org/t/vulnerability-report-cross-site-scripting-xss-in-the-api-access-page/15431
https://github.com/librenms/librenms
https://github.com/librenms/librenms/pull/12739

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