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CVE-2026-26989
LibreNMS has Stored XSS in Alert Rule
Medium4.3EPSS 0.27%
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Medium4.3 | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:L |
| NVDNVD · Analyzed | 3.1 | Medium4.8 | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N |
- EPSS (exploitation in 30 days)
- 0.27% · top 80% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.3.
Weakness
Affected products
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Packagistlibrenms/librenmsGHSA-6xmx-xr9p-58p7 (opens in a new tab)
References (4)
- https://github.com/librenms/librenms/security/advisories/GHSA-6xmx-xr9p-58p7 (opens in a new tab)x_refsource_CONFIRM
- https://github.com/librenms/librenms/pull/19039 (opens in a new tab)x_refsource_MISC
- https://github.com/librenms/librenms/commit/087608cf9f851189847cb8e8e5ad002e59170c58 (opens in a new tab)x_refsource_MISC
- https://github.com/librenms/librenms/releases/tag/26.2.0 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-6xmx-xr9p-58p7 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-26989)Record last updated .