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CVE-2026-26989

LibreNMS has Stored XSS in Alert Rule

Published: Feb 20, 2026Updated: Feb 20, 2026 Sources: CVE List NVD GHSACWE-79
NVD MITRE
4.3CVSSMEDIUM
EPSS Score
0.2%
Top 85.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Versions 25.12.0 and below are affected by a Stored Cross-Site Scripting (XSS) vulnerability in the Alert Rules workflow. An attacker with administrative privileges can inject malicious scripts that execute in the browser context of any user who accesses the Alert Rules page. This issue has been fixed in version 26.2.0.

CVSS Vector Breakdown

AV:NAC:LPR:HUI:RS:UC:LI:LA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:LAvailability
Low
Open in CVSS calculator →

Weaknesses

CWE-79

Affected Products

librenmslibrenms
On-prem
Enterprise Software / itsm-monitoring
librenms/librenmsPackagistOSS Libraries
librenmsoss-projectEnterprise Softwareaka librenms/librenms, librenms
packagistpackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/librenms/librenms/security/advisories/GHSA-6xmx-xr9p-58p7
github.com
https://github.com/librenms/librenms/pull/19039
github.com
https://github.com/librenms/librenms/commit/087608cf9f851189847cb8e8e5ad002e59170c58
github.com
and 3 more references View all →

Timeline

Published
Feb 20, 2026
Last Updated
Feb 20, 2026

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