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Medium, CVSS 6.1

Cross-site Scripting in LibreNMS

CVE-2021-44279GHSA-5vr6-hm68-5j9p

What to do

Vendor response not established. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • Packagist librenms/librenms

    Affected
    <= 21.11.0
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
6.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS
  • CVE-2021-44279: 0.65% estimated exploitation activity in the next 30 days; percentile 51.13 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

LibreNMS 21.11.0 is affected by is affected by a Cross Site Scripting (XSS) vulnerability in includes/html/forms/poller-groups.inc.php.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-5vr6-hm68-5j9p

Agent brief

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# Patch Next advisory brief: CVE-2021-44279

Advisory: Cross-site Scripting in LibreNMS
IDs: CVE-2021-44279, GHSA-5vr6-hm68-5j9p
Record: https://patchnext.com/advisories/cve-2021-44279 (revision 1, source checked 26 Oct 2026, 14:04 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist librenms/librenms: affected <= 21.11.0

## Suggested inspection (read-only)
- Packagist librenms/librenms: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on librenms/librenms.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-5vr6-hm68-5j9p (GitHub-reviewed advisory GHSA-5vr6-hm68-5j9p lists affected ranges: Packagist librenms/librenms >=0 <=21.11.0)

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