CVE WatchOct 16, 2026

CVE-2026-102893

Zulip is an open-source team collaboration tool. In Zulip Server versions through 12.1, GenericOpenIdConnectBackend matches the identity pro

CVSS

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No CVSS

EPSS

0.4%

p32

KEV

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Exploit Today

0-100

Published: Oct 14, 2026 · Last modified: Oct 16, 2026 · CWE-287

EPSS · 30d

0.4%EPSS · 30 days0.4%

2026-10-152026-10-20

Technical 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.

Official references

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