CVE-2026-102893Zulip: OpenID Connect authentication ignores the email_verified claim
Updated under an hour ago ()
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It affects zulip. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.39%, higher than 31% of scored CVEs.
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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 (v4.0, CNA)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
- Weakness (CWE)
- CWE-287
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.39% (percentile 31)
- Assigned by
- GitHub_M
- NVD analysis
- Awaiting Analysis
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 14, 2026
Affected products
zulip zulip zulip:zulip (from the name) | before 12.2 | CNA record |
References
- https://github.com/zulip/zulip/security/advisories/GHSA-xw9h-9rcm-hx4mx-refsource-confirm
- https://github.com/zulip/zulip/pull/39913x-refsource-misc
- https://github.com/zulip/zulip/commit/68d2d9defa39f8af96a50fc7430efc34dee120b5x-refsource-misc
- https://github.com/zulip/zulip/commit/b40f191a8c71e74fcb471f71de6a1233de157102x-refsource-misc
- https://github.com/zulip/zulip/releases/tag/12.2x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.