CVE-2026-45694
Medium · CVSS 5.4Published 2026-08-26
CVSS
5.4
Medium
EPSS
0.1%
exploit probability
Active Exploit
No
not yet listed
What is CVE-2026-45694?
LibreNMS is a network monitoring system. In versions up to and including 26.4.0, the Proxmox application view is vulnerable to reflected cross-site scripting through the user-supplied instance and vmid GET parameters, which are reflected into the page title without adequate encoding. The parameters are placed into the page title with only strip_tags applied, and the title is then written into an inline document.title assignment through string interpolation, so a single quote terminates the JavaScript string and the remaining input runs as script. An attacker who lures an authenticated user into following a crafted link can execute script in that user's session, enabling actions such as theft of session data. This issue is fixed in version 26.5.0.
CVSS Score Explained
CVSS 5.4 is Medium severity. Exploitation usually requires some specific conditions (local access, user interaction, or a particular config). Still worth patching in your next maintenance window.
EPSS Exploitation Probability
EPSS 0.1% — low probability of active exploitation. Can be handled in normal patch cycles.
References & Patches
- ›https://github.com/librenms/librenms/commit/0be1bfd7746cea26bf7da40e82b70f75b724d0f8
- ›https://github.com/librenms/librenms/security/advisories/GHSA-jmqm-f8q4-v7wx
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