medium5.3
CVE-2026-26987
LibreNMS affected by reflected xss via email field
Impact
### 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
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| composer | librenms/librenms | < 26.2.0 | 26.2.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Librenms | Librenms | before 26.2.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/librenms/librenms/commit/8e626b38ef92e240532cdac2ac7e38706a71208b
- https://github.com/librenms/librenms/pull/19038
- https://github.com/librenms/librenms/releases/tag/26.2.0
- https://github.com/librenms/librenms/security/advisories/GHSA-gqx7-99jw-6fpr
- https://github.com/advisories/GHSA-gqx7-99jw-6fpr
- https://nvd.nist.gov/vuln/detail/CVE-2026-26987