TI-2026-33435 Aliases CVE-2026-45694 GHSA-jmqm-f8q4-v7wx

LibreNMS: Reflected XSS in the Proxmox app view via unsanitized instance/vmid parameters

LOW 24CWE-79Published 2026-08-26 · Updated 2026-08-27

Key facts

Attack vector: Network
Privileges required: Low
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00235 14th percentileScored 2026-11-07

Fix Fixed librenms (librenms): 26.5.0librenms/librenms (Packagist): 26.5.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
librenms	librenms	before 26.5.0	26.5.0	Patch available	CNA
—	librenms/librenms (Packagist)	before 26.5.0	26.5.0	Patch available	GHSA-jmqm-f8q4-v7wx

librenms Vendorlibrenms Affected before 26.5.0 Fixed in 26.5.0 Patch available CNA
librenms/librenms (Packagist) Vendor— Affected before 26.5.0 Fixed in 26.5.0 Patch available GHSA-jmqm-f8q4-v7wx

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:librenms:librenms::::::::	—	—	librenms

cpe:2.3:a:librenms:librenms:*:*:*:*:*:*:*:* Versions — — ·librenms

Remediation

Fix · CNA librenms (librenms) Fixed in 26.5.0
Fix · GHSA-jmqm-f8q4-v7wx librenms/librenms (Packagist) Fixed in 26.5.0 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-45694
2026-10-03 Alias added: GHSA-jmqm-f8q4-v7wx

References

Other 4

TI-2018-14479 LibreNMS 1.46 allows remote attackers to execute arbitrary OS commands by using the… CVSS 3.0CRITICAL 9.8
TI-2026-71173 LDAP filter injection in LibreNMS allows authentication bypass CVSS 4.0CRITICAL 9.2
TI-2026-59134 LibreNMS before 26.8.0 Authentication Bypass via API Token Type Confusion CVSS 4.0CRITICAL 9.2
TI-2026-57885 LibreNMS before 26.7.0 Stored XSS via Oxidized API CVSS 4.0CRITICAL 9.2
TI-2022-03735 Insufficient Session Expiration in librenms/librenms CVSS 3.1CRITICAL 9.8
TI-2026-57886 LibreNMS before 26.5.0 Remote Code Execution via AboutController CVSS 4.0HIGH 8.7

See all 123 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences