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CVE-2026-27016
LibreNMS has Stored XSS in Custom OID - unit parameter missing strip_tags()
Medium5.4EPSS 0.26%
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
Description
LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Versions 24.10.0 through 26.1.1 are vulnerable to Stored XSS via the unit parameter in Custom OID. The Custom OID functionality lacks strip_tags() sanitization while other fields (name, oid, datatype) are sanitized. The unsanitized value is stored in the database and rendered without HTML escaping. This issue is fixed in version 26.2.0.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Medium5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
| NVDNVD · Analyzed | 3.1 | Medium5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
- EPSS (exploitation in 30 days)
- 0.26% · top 82% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
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The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.4.
Weakness
Affected products
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Packagistlibrenms/librenmsGHSA-fqx6-693c-f55g (opens in a new tab)
References (4)
- https://github.com/librenms/librenms/security/advisories/GHSA-fqx6-693c-f55g (opens in a new tab)x_refsource_CONFIRM
- https://github.com/librenms/librenms/pull/19040 (opens in a new tab)x_refsource_MISC
- https://github.com/librenms/librenms/commit/3bea263e02441690c01dea7fa3fe6ffec94af335 (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-fqx6-693c-f55g (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-2026-27016)Record last updated .