{"id":"CVE-2026-102893","revision":"ffc11b0d99fa465fb759b003f8a98f92","records":[{"revision":"ffc11b0d99fa465fb759b003f8a98f92","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-102893","aliases":[],"title":"Zulip: OpenID Connect authentication ignores the email_verified claim","description":"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.","state":0,"publishedAt":"2026-10-14T15:49:03.442+00:00","modifiedAt":"2026-10-15T19:06:20.918+00:00","affected":[{"ecosystem":"Vendor product","name":"zulip","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"zulip\",\n                    \"product\": \"zulip\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 12.2\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":9.1,"severity":"CRITICAL"}],"references":["https://github.com/zulip/zulip/security/advisories/GHSA-xw9h-9rcm-hx4m","https://github.com/zulip/zulip/pull/39913","https://github.com/zulip/zulip/commit/68d2d9defa39f8af96a50fc7430efc34dee120b5","https://github.com/zulip/zulip/commit/b40f191a8c71e74fcb471f71de6a1233de157102","https://github.com/zulip/zulip/releases/tag/12.2"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-102893","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-102893","identifiers":["CVE-2026-102893"]},"retained":false,"historicalAffected":[]}],"coverage":[]}