Medium [CVE-2026-45694] Proxmox: LibreNMS is a network monitoring system
This medium-severity Proxmox advisory covers CVE-2026-45694 affecting Proxmox.
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Summary
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.
- through 26.4.0
NVD record · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation
Upgrade to a fixed release: 26.5.0. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
NVD record · high-confidence parse· fetched 2 hours ago·verify at source
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