{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "12.2"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1e73e1d754761b73c18135a3f25d0673f31cd8b3"
            }
          ],
          "repo": "https://github.com/zulip/zulip",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-xw9h-9rcm-hx4m"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-287"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102893.json"
  },
  "details": "Zulip is an open-source team collaboration tool. In Zulip Server versions through 12.1, GenericOpenIdConnectBackend matches the identity provider email claim to an active account's delivery_email without rejecting an explicitly false email_verified claim. If a configured identity provider returns an email address that the authenticating user does not control together with email_verified=false, Zulip can log the user into the existing account for that address. Exploitation requires a misconfigured trusted identity provider, and deployments whose authoritative identity provider only emits email addresses controlled by the authenticating user are not affected. This issue is fixed in version 12.2.",
  "id": "CVE-2026-102893",
  "modified": "2026-10-15T02:30:27.211244414Z",
  "published": "2026-10-14T15:49:03.442Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102893.json"
    },
    {
      "type": "FIX",
      "url": "https://github.com/zulip/zulip/commit/68d2d9defa39f8af96a50fc7430efc34dee120b5"
    },
    {
      "type": "FIX",
      "url": "https://github.com/zulip/zulip/commit/b40f191a8c71e74fcb471f71de6a1233de157102"
    },
    {
      "type": "FIX",
      "url": "https://github.com/zulip/zulip/pull/39913"
    },
    {
      "type": "WEB",
      "url": "https://github.com/zulip/zulip/releases/tag/12.2"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/zulip/zulip/security/advisories/GHSA-xw9h-9rcm-hx4m"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-102893"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Zulip: OpenID Connect authentication ignores the email_verified claim"
}