Security advisory

{
  "id": "37a7d0d4ec73c2767c787470cd9e099fb2a11a03b55730b46c0352aaf52f7f6e",
  "url": "https://osv.dev/vulnerability/CVE-2026-38991",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-38991",
    "summary": "Cockpit 2.13.5 and earlier is affected by a misconfiguration within the Bucket component _isFileTypeAllowed function where a specially crafted filename bypasses an extension filter. This allows an authenticated attacker to rename arbitrary files with the .php file extension enabling arbitrary code to be executed on the underlying server.",
    "evidence": "osv:CVE-2026-38991",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-38991",
      "aliases": [
        "CVE-2026-38991",
        "GHSA-j2rx-4jg9-79mw"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/cockpit-hq/cockpit",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "dde2d1d74f5f4e11de42a298918ea8c9684f932c"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.13.5"
                      }
                    ],
                    "source": "DESCRIPTION"
                  },
                  {
                    "range": [
                      {
                        "fixed": "dde2d1d74f5f4e11de42a298918ea8c9684f932c"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "2.14.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.13.5",
            "2.13.4",
            "2.13.3",
            "2.13.2",
            "2.13.1",
            "2.13.0",
            "2.12.1",
            "2.12.0",
            "2.11.4",
            "2.11.3",
            "2.11.2",
            "2.11.1",
            "2.11.0",
            "2.10.3",
            "2.10.2",
            "2.10.1",
            "2.10.0",
            "2.9.4",
            "2.9.3",
            "2.9.2",
            "2.9.1",
            "2.9.0",
            "2.8.6",
            "2.8.5",
            "2.8.4",
            "2.8.3",
            "2.8.2",
            "2.8.1",
            "2.8.0",
            "2.7.2",
            "2.7.1",
            "2.7.0",
            "2.6.3",
            "2.6.2",
            "2.6.1",
            "2.6.0",
            "2.5.2",
            "2.5.1",
            "2.5.0",
            "2.4.1",
            "2.4.0",
            "2.3.9",
            "2.3.8",
            "2.3.7",
            "2.3.6",
            "2.3.5",
            "2.3.4",
            "2.3.3",
            "2.3.2",
            "2.3.1",
            "2.3.0",
            "2.2.2",
            "2.2.1",
            "2.2.0",
            "2.1.2",
            "2.1.1",
            "2.1.0",
            "2.0.2",
            "2.0.1",
            "2.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-38991.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.070801499Z",
      "provider": "osv",
      "references": [
        "https://felsec.com/posts/cockpit-cms-2.13.5-multi-vulns/",
        "https://github.com/Cockpit-HQ/Cockpit/releases/tag/2.14.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/38xxx/CVE-2026-38991.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-38991"
      ],
      "provider_metadata": {
        "cna_assigner": "mitre",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/38xxx/CVE-2026-38991.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-38991",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 493278,
  "published_at": "2026-04-29T00:00:00+00:00"
}