CVE-2026-102893
CVE-2026-102893 · Zulip: OpenID Connect authentication ignores the email_verified claim
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 9.1 · Critical · EPSS 0.4%
- Published
- Updated
Affected products and versions
zulip
- Versions
- < 12.2: Affected
No fix published
Original sources
- 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
- https://nvd.nist.gov/vuln/detail/CVE-2026-102893