GitHub Advisoryadvisory · Packagist
GHSA-gqx7-99jw-6fpr LibreNMS affected by reflected xss via email field
MEDIUM
Official page ↗
- Aliases
- CVE-2026-26987
- Ecosystem
- Packagist
- Packages
- librenms/librenms
- Severity
- Moderate
- CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
- Weaknesses
- CWE-79
- Reviewed
- 2026-02-18
Affected packages
• Packagist librenms/librenms: < 26.2.0 → fixed in 26.2.0
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
``
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
Related
Alias · CVE (1)
- CVE-2026-26987 LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. vulnerability
Weakness · CWE (1)
- CWE-79 Improper Neutralization of Input During Web Page Generation weakness
References
- https://github.com/librenms/librenms/security/advisories/GHSA-gqx7-99jw-6fpr web
- https://nvd.nist.gov/vuln/detail/CVE-2026-26987 advisory
- https://github.com/librenms/librenms/pull/19038 web
- https://github.com/librenms/librenms/commit/8e626b38ef92e240532cdac2ac7e38706a71208b web
- https://github.com/librenms/librenms package
- https://github.com/librenms/librenms/releases/tag/26.2.0 web