Cross-site scripting in LibreNMS - CVE-2026-45694
Published: August 4, 2026
Vulnerability identifier: #VU140836
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-45694
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary script in the victim's browser.
The vulnerability exists due to cross-site scripting in LegacyController.php document.title JavaScript assignment when handling crafted Proxmox instance and vmid GET parameters. A remote user can send a specially crafted link to execute arbitrary script in the victim's browser.
User interaction is required, and the victim must follow a crafted link. An authenticated session is required.
Affected software
LibreNMS
How to mitigate CVE-2026-45694
Install security update from vendor's website.
LibreNMS - update to 26.5.0