{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": [
              "cpe:2.3:a:zammad:zammad:*:*:*:*:*:*:*:*",
              "cpe:2.3:a:zammad:zammad:7.0.0:*:*:*:*:*:*:*"
            ],
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "6.5.4"
              },
              {
                "introduced": "7.0.0"
              },
              {
                "last_affected": "7.0.0"
              }
            ],
            "source": [
              "CPE_RANGE",
              "CPE_STRING"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "15c7e6d4ffd95c84535d334b7c0ce0bc2fbc5228"
            },
            {
              "introduced": "f3228274c4feefac470d7efad12f240debd678bc"
            },
            {
              "last_affected": "f3228274c4feefac470d7efad12f240debd678bc"
            }
          ],
          "repo": "https://github.com/zammad/zammad",
          "type": "GIT"
        }
      ],
      "versions": [
        "7.0.0"
      ]
    }
  ],
  "aliases": [
    "GHSA-mfwp-hx66-626c"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-352"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34721.json"
  },
  "details": "Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the OAuth callback endpoints for Microsoft, Google, and Facebook external credentials do not validate a CSRF state parameter. This vulnerability is fixed in 7.0.1 and 6.5.4.",
  "id": "CVE-2026-34721",
  "modified": "2026-07-15T01:49:00.472143895Z",
  "published": "2026-04-08T18:12:32.504Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34721.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/zammad/zammad/security/advisories/GHSA-mfwp-hx66-626c"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34721"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Zammad has Cross-site request forgery (CSRF) in OAuth callback endpoints"
}