Zammad: Pending upload deletion bypass via legacy attachment endpoint

{
  "id": "9168e66cb3d48f97bddab2f519b555750804b9830446174d96222fce8c08b7dc",
  "url": "https://osv.dev/vulnerability/CVE-2026-65828",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Zammad: Pending upload deletion bypass via legacy attachment endpoint",
    "summary": "Zammad is a web based open source helpdesk/customer support system. Prior to 7.1.2, the legacy destroy_form action on AttachmentsController deletes UploadCache Store records based solely on a user-supplied form_id without verifying that the requesting user owns those records. An authenticated attacker who learns another user's pending-upload UUID can silently remove temporary file uploads before the victim submits their ticket or article. This issue is fixed in version 7.1.2.",
    "evidence": "osv:CVE-2026-65828",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2026-65828",
      "aliases": [
        "CVE-2026-65828",
        "GHSA-x4f3-367g-m93g"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/zammad/zammad",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "7195a4a3e3ba9e801b6ad93f191ae423ed573d15"
                },
                {
                  "fixed": "3b755736fdbee8ff6ddf53661d6912d3d3028325"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "7.1.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "3b755736fdbee8ff6ddf53661d6912d3d3028325"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "7.1.1",
            "7.1.0",
            "7.1.0-alpha",
            "7.0.0-alpha",
            "6.6.0-alpha",
            "6.5.0-alpha",
            "6.4.0-alpha",
            "6.3.0-alpha",
            "6.2.0-alpha",
            "6.1.0-alpha",
            "6.0.0-alpha",
            "5.5.0-alpha",
            "5.4.0-alpha",
            "5.3.0-alpha",
            "5.2.0-alpha",
            "3.7.0",
            "1.6.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-65828.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:21.398488815Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/65xxx/CVE-2026-65828.json",
        "https://github.com/zammad/zammad/security/advisories/GHSA-x4f3-367g-m93g",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-65828",
        "https://github.com/zammad/zammad/commit/3b755736fdbee8ff6ddf53661d6912d3d3028325"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-862"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/65xxx/CVE-2026-65828.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-65828",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 487713,
  "published_at": "2026-09-25T17:28:13.159+00:00"
}