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.
Metrics
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References
History
Fri, 23 Oct 2026 00:45:00 +0000
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Zulip
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Thu, 15 Oct 2026 20:30:00 +0000
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Wed, 14 Oct 2026 16:00:00 +0000
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| 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. | |
| Title | Zulip: OpenID Connect authentication ignores the email_verified claim | |
| Weaknesses | CWE-287 | |
| References |
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| Metrics |
cvssV4_0
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-10-14T15:49:03.442Z
Updated: 2026-10-15T19:06:20.918Z
Reserved: 2026-09-29T17:34:42.743Z
Link: CVE-2026-102893
Updated: 2026-10-15T19:06:07.115Z
Status : Awaiting Analysis
Published: 2026-10-14T16:17:29.987
Modified: 2026-10-16T20:02:37.630
Link: CVE-2026-102893
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