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.
References
- www.cve.org/CVERecord ↗
- nvd.nist.gov/vuln/detail/CVE-2026-102893 ↗
- github.com/zulip/zulip/commit/68d2d9defa39f8af96a50fc7430efc34dee120b5 ↗
- github.com/zulip/zulip/commit/b40f191a8c71e74fcb471f71de6a1233de157102 ↗
- github.com/zulip/zulip/pull/39913 ↗
- github.com/zulip/zulip/releases/tag/12.2 ↗
- github.com/zulip/zulip/security/advisories/GHSA-xw9h-9rcm-hx4m ↗
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This product uses the NVD API but is not endorsed or certified by the NVD. CVSS scores do not establish exploitation.