CVE-2026-102893

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.

• CWE-287

• https://github.com/zulip/zulip/commit/68d2d9defa39f8af96a50fc7430efc34dee120b5
• https://github.com/zulip/zulip/commit/b40f191a8c71e74fcb471f71de6a1233de157102
• https://github.com/zulip/zulip/pull/39913
• https://github.com/zulip/zulip/releases/tag/12.2
• https://github.com/zulip/zulip/security/advisories/GHSA-xw9h-9rcm-hx4m

Published

Oct 14, 2026

Last Modified

Oct 16, 2026

Status

Awaiting Analysis

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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