Security advisory

{
  "id": "4c327edd2e0c964cfd326ab13819e6bb357d167658e0a0abcba5d48ce9af1d11",
  "url": "https://osv.dev/vulnerability/CVE-2026-26378",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-26378",
    "summary": "Cross Site Scripting vulnerability in Koha 25.11 and before allows a remote attacker to execute arbitrary code via file upload function in Invoice features",
    "evidence": "osv:CVE-2026-26378",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-26378",
      "aliases": [
        "CVE-2026-26378"
      ],
      "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/koha-community/koha",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "3f2987eb19f7ac1987591d8e9b01961c39405b39"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:koha:koha:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "25.11.00"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v25.11.00",
            "v25.05.00-1",
            "v25.05.00-2",
            "v24.11.00",
            "v24.05.00",
            "v23.11.00",
            "v23.05.00",
            "v22.11.00",
            "v22.05.00",
            "v21.11.00",
            "v21.05.00",
            "v20.11.00",
            "v20.05.00",
            "v19.11.00",
            "v19.05.00",
            "v18.11.00",
            "v18.05.00",
            "v18.05.00-rc1",
            "v17.11.00",
            "v17.05.00",
            "v16.11.00",
            "v16.05.00",
            "v16.05.00-beta",
            "v3.22.00",
            "v3.22.00-beta",
            "v3.20.00",
            "v3.20.00-beta",
            "v3.18.00",
            "v3.18.00-beta",
            "v3.16.00",
            "v3.16.00-rc",
            "v3.16.00-beta",
            "v3.14.00-beta",
            "v3.14.00-alpha2",
            "v3.14.00-alpha1",
            "v3.12.00-beta1",
            "v3.12.00-alpha2",
            "v3.12.00-alpha",
            "v3.08.00",
            "v3.04.00",
            "v3.02.00-beta",
            "v3.02.00-alpha2",
            "v3.02.00-alpha",
            "v3.00.00",
            "v3.00.00-stableRC1",
            "v3.00.00-beta2",
            "v3.00.00-beta",
            "v3.00.00-alpha",
            "R_2-4",
            "R_2-1",
            "R_2-0-0RC1",
            "R_2-0-0pre5",
            "R_2-0-0pre4",
            "R_2-0-0pre3",
            "R_2-0-0pre2",
            "R_2-0-0pre1",
            "R_1-9-3",
            "R_1-9-2",
            "R_1-9-1",
            "R_1-9-0",
            "R_1-3-3",
            "R_1-3-2",
            "R_1-3-1",
            "R_1-3-0",
            "R_1-2-2RC4"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-26378.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:51.535161125Z",
      "provider": "osv",
      "references": [
        "https://g03m0n.github.io",
        "https://g03m0n.github.io/posts/cve-2026-26378/",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26378.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-26378",
        "https://github.com/Koha-Community/Koha"
      ],
      "provider_metadata": {
        "cna_assigner": "mitre",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "last_affected": "25.11"
                  }
                ],
                "source": "DESCRIPTION"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26378.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-26378",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 520289,
  "published_at": "2026-06-03T00:00:00+00:00"
}