ZITADEL: 1-Click Account Takeover via XSS in /saml-post Endpoint

{
  "id": "0a1d26cfaa6fdb5d1763d0256c6ca340d747b1835e38e8bea3fb8785adc6db08",
  "url": "https://osv.dev/vulnerability/CVE-2026-29191",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ZITADEL: 1-Click Account Takeover via XSS in /saml-post Endpoint",
    "summary": "ZITADEL is an open source identity management platform. From version 4.0.0 to 4.11.1, a vulnerability in Zitadel's login V2 interface was discovered that allowed a possible account takeover via XSS in /saml-post Endpoint. This issue has been patched in version 4.12.0.",
    "evidence": "osv:CVE-2026-29191",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-29191",
      "aliases": [
        "CVE-2026-29191",
        "GHSA-pr34-2v5x-6qjq",
        "GO-2026-4607"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/zitadel/zitadel",
              "type": "GIT",
              "events": [
                {
                  "introduced": "c86c60bab86b64b44755d2776703939c01686055"
                },
                {
                  "fixed": "f360bc52bd5ce35a8aec21870de22a3b38967081"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "4.0.0"
                      },
                      {
                        "fixed": "4.12.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "cpe": "cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.0.0"
                      },
                      {
                        "fixed": "4.12.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v4.11.1",
            "v4.11.0",
            "v4.10.1",
            "v4.10.0",
            "v4.9.2",
            "v4.9.1",
            "v4.9.0",
            "v4.8.1",
            "v4.8.0",
            "v4.7.6",
            "v4.7.5",
            "v4.7.4",
            "v4.7.3",
            "v4.7.2",
            "v4.7.1",
            "v4.7.0",
            "v4.6.6",
            "v4.6.5",
            "v4.6.4",
            "v4.6.3",
            "v4.6.2",
            "v4.6.1",
            "v4.6.0",
            "v4.5.0",
            "v4.4.0",
            "v4.3.3",
            "v4.3.2",
            "v4.3.1",
            "v4.3.0",
            "v4.2.2",
            "v4.2.1",
            "v4.2.0",
            "v4.1.4",
            "v4.1.3",
            "v4.1.2",
            "v4.1.1",
            "v4.1.0",
            "v4.0.3",
            "v4.0.2",
            "v4.0.1",
            "v4.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-29191.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:23.461717424Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29191.json",
        "https://github.com/zitadel/zitadel/security/advisories/GHSA-pr34-2v5x-6qjq",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-29191"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-79"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29191.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-29191",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 490071,
  "published_at": "2026-03-07T15:07:02.706+00:00"
}