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GHSA-gqx7-99jw-6fpr

Fix: librenms/librenms#19038

GHSA-gqx7-99jw-6fpr is a Cross-site Scripting (XSS) vulnerability in librenms/librenms. O3 Security confirms whether GHSA-gqx7-99jw-6fpr is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

LibreNMS affected by reflected xss via email field

Also known asCVE-2026-26987
Published
Feb 18, 2026
Updated
Feb 20, 2026
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Feb 20, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected
🐘librenms/librenms

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

Summary

reflected xss via email field

Details

  1. visit http://127.0.0.1/settings/alerting/email
  2. in the email address input but this payload <img src=1 onerror=alert(document.cookie)>
  3. notice the alert

PoC

Impact

can lead to ATO

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistlibrenms/librenmsall versions26.2.0

Detection & mitigation playbook

Open-source dependency
  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for librenms/librenms. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

  2. Fix

    Update librenms/librenms to 26.2.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-gqx7-99jw-6fpr is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

  4. How O3 protects you

    O3 pinpoints whether GHSA-gqx7-99jw-6fpr is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to GHSA-gqx7-99jw-6fpr. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

### Summary reflected xss via email field ### Details 1. visit `http://127.0.0.1/settings/alerting/email` 2. in the email address input but this payload `<img src=1 onerror=alert(document.cookie)>` 3. notice the alert ### PoC - video attached with the report https://github.com/user-attachments/assets/c1b443f5-85c6-4545-b04f-def06d82b42e ### Impact can lead to ATO
O3 Security · Impact-Aware SCA

Is GHSA-gqx7-99jw-6fpr in your dependencies?

O3 detects GHSA-gqx7-99jw-6fpr across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

GHSA-gqx7-99jw-6fpr: LibreNMS affected by… | O3 Security