CVE-2021-31274 json
Cross-site Scripting in LibreNMS
published 2021-09-08 5 y ago modified 2026-06-17 4 mo ago also GHSA-2r2w-jrh2-p4gr , EUVD-2021-1952
- cvss
- 5.4
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.8%
- EPSS 0.8% chance of exploitation in 30 days, percentile 56%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- packagist librenms/librenms 21.3.0
- librenms librenms 21.3.0
- github.com/librenms/librenms#12739 pull request
Exploit prediction
0.78% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 3.5 | AV:N/AC:M/Au:S/C:N/I:P/A:N |
| GitHub | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | librenms/librenms | <21.3.0 |
21.3.0 |
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
github.com
/librenms/librenms/pull/12739
web, patch, third-party-advisory
-
community.librenms.org
/t/vulnerability-report-cross-site-scripting-xss-in-the-api-access-page/15431
web, vendor-advisory
-
github.com
/librenms/librenms
web, product, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-31274
advisory
Sources
- CVE List CVE-2021-31274
- GitHub Advisory GHSA-2r2w-jrh2-p4gr
- NVD CVE-2021-31274
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.