CVE-2026-26987
LibreNMS affected by reflected xss via email field
EPSS 0.00%
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 - video attached with the report https://github.com/user-attachments/assets/c1b443f5-85c6-4545-b04f-def06d82b42e ### Impact can lead to ATO
How to fix CVE-2026-26987
To remediate CVE-2026-26987, upgrade the affected package to a fixed version below.
- Packagist/librenms/librenms—upgrade to 26.2.0 or later
Is CVE-2026-26987 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 26.2.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | 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 |