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Medium, CVSS 4.8amended

LibreNMS: Stored XSS via graph_descr admin config settings echoed without escaping to all authenticated users

CVE-2026-84188GHSA-7cj5-v4pp-v632

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (librenms/librenms 26.7.0), redeploy, then verify what is actually installed.

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

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
4.8 · CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
EPSS
  • CVE-2026-84188: 0.25% estimated exploitation activity in the next 30 days; percentile 16.69 (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.

Summary The graphdescr.<graphtype family of settings is echoed verbatim without htmlspecialchars() in includes/html/pages/graphs.inc.php:194. Any admin can store a malicious HTML payload that executes in every authenticated user's browser viewing that graph type. CVSS CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N — 4.8 Medium Details PoC Fix Prerequisite Admin session to set the config value.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-7cj5-v4pp-v632

  2. Revision 1 · created ·

    Published from osv record GHSA-7cj5-v4pp-v632

Agent brief

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# Patch Next advisory brief: CVE-2026-84188

Advisory: LibreNMS: Stored XSS via graph_descr admin config settings echoed without escaping to all authenticated users
IDs: CVE-2026-84188, GHSA-7cj5-v4pp-v632
Record: https://patchnext.com/advisories/cve-2026-84188 (revision 2, source checked 26 Oct 2026, 14:50 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.8)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: librenms/librenms 26.7.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist librenms/librenms: affected < 26.7.0; fixed in 26.7.0

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

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## 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://osv.dev/vulnerability/GHSA-7cj5-v4pp-v632 (OSV record GHSA-7cj5-v4pp-v632 lists affected ranges: Packagist librenms/librenms >=0 <26.7.0 (fixed))
- Verified: https://github.com/advisories/GHSA-7cj5-v4pp-v632 (GitHub-reviewed advisory GHSA-7cj5-v4pp-v632 lists affected ranges: Packagist librenms/librenms >=0 <26.7.0)

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