LibreNMS has Stored XSS in Custom OID - unit parameter missing strip_tags()

{
  "id": "fd46c37a9e6204f172e075519bb5b4f72c37b9372bdb6f1a190b9fa29fddca1a",
  "url": "https://osv.dev/vulnerability/CVE-2026-27016",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "LibreNMS has Stored XSS in Custom OID - unit parameter missing strip_tags()",
    "summary": "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.",
    "evidence": "osv:CVE-2026-27016",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-27016",
      "aliases": [
        "CVE-2026-27016",
        "GHSA-fqx6-693c-f55g"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/librenms/librenms",
              "type": "GIT",
              "events": [
                {
                  "introduced": "a625d1ef0b66e093414d8d440f8b5f4f85baadfa"
                },
                {
                  "fixed": "eeaa05618c22140d087739097b217800b0d6621f"
                },
                {
                  "fixed": "3bea263e02441690c01dea7fa3fe6ffec94af335"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:librenms:librenms:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "24.10.0"
                      },
                      {
                        "fixed": "26.2.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "3bea263e02441690c01dea7fa3fe6ffec94af335"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "eeaa05618c22140d087739097b217800b0d6621f"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "26.2.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "26.1.0",
            "25.12.0",
            "25.11.0",
            "25.10.0",
            "25.9.0",
            "25.8.0",
            "25.7.0",
            "25.6.0",
            "25.5.0",
            "25.4.0",
            "25.3.0",
            "25.2.0",
            "25.1.0",
            "24.12.0",
            "24.11.0",
            "24.10.1",
            "24.10.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-27016.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.495827914Z",
      "provider": "osv",
      "references": [
        "https://github.com/librenms/librenms/releases/tag/26.2.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27016.json",
        "https://github.com/librenms/librenms/security/advisories/GHSA-fqx6-693c-f55g",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-27016",
        "https://github.com/librenms/librenms/commit/3bea263e02441690c01dea7fa3fe6ffec94af335",
        "https://github.com/librenms/librenms/pull/19040"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-116",
          "CWE-79"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27016.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-27016",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 491831,
  "published_at": "2026-02-20T01:34:11.241+00:00"
}