CVE-2026-26989

MEDIUM EPSS 14.7%
Published Feb 20, 20264mo ago · Modified Jun 17, 20262w ago
4.8 CVSS 3.1
Medium
Find Similar
Published Feb 20, 2026 4mo ago
Last Modified Jun 17, 2026 2w ago

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 Details

Base Score
4.8
Exploitability
1.7
Impact
2.7
Vector string
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required High
User Interaction Required
Scope Changed
Confidentiality Low
Integrity Low
Availability None

Threat Intelligence

EPSS Exploit Probability
14.7% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-79 Cross-site Scripting Injection

Affected Products 1

VendorProductVersionRange
librenmslibrenms* <26.2.0

References 4

  • github.com https://github.com/librenms/librenms/commit/087608cf9f851189847cb8e8e5ad002e59170c58
    Patch
  • github.com https://github.com/librenms/librenms/pull/19039
    Issue Tracking
  • github.com https://github.com/librenms/librenms/releases/tag/26.2.0
    ProductRelease Notes
  • github.com https://github.com/librenms/librenms/security/advisories/GHSA-6xmx-xr9p-58p7
    ExploitThird Party Advisory

Remediation

  • github.com https://github.com/librenms/librenms/commit/087608cf9f851189847cb8e8e5ad002e59170c58
    Patch