CVE-2026-26987 LibreNMS affected by reflected XSS via email field
Attackers can execute arbitrary scripts in victim browsers via the email field, potentially leading to session hijacking or data theft.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-26987?
CVE-2026-26987 is a medium-severity cross-site scripting vulnerability in Librenms Librenms, published on 20 Feb 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Versions 25.12.0 and below are vulnerable to Reflected XSS attacks via email field. This issue has been fixed in version 26.2.0.
Weakness: CWE-79
Which versions are affected by CVE-2026-26987?
2 open source packages ship an affected version, including librenms/librenms. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
librenms/librenms Packagist | All versions | 26.2.0 |
librenms/librenms Packagist | All versions | 26.2.0 |
Products include Librenms Librenms.
How do I fix CVE-2026-26987?
Upgrade librenms/librenms to 26.2.0 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-26987 being exploited?
There is no known exploitation of CVE-2026-26987 in the wild and no public exploit code.
Other vulnerabilities in Librenms Librenms
Sources
Also known as GHSA-gqx7-99jw-6fpr.