CVE-2026-102893— Zulip: OpenID Connect authentication ignores the email_verified claim
Quick assessment
Affected
zulip zulip
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-102893
Vulnerability Information
Shenlong is analyzing...
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
Zulip: OpenID Connect authentication ignores the email_verified claim
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-102893
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-102893
请登录查看更多情报信息。
Other References for CVE-2026-102893 (5)
-
https://github.com/zulip/zulip/pull/39913 x_refsource_MISC
-
https://github.com/zulip/zulip/releases/tag/12.2 x_refsource_MISC
-
https://github.com/zulip/zulip/security/advisories/GHSA-xw9h-9rcm-hx4m x_refsource_CONFIRM
IV. Related Vulnerabilities
Same product: zulip
-
CVE-2026-100404
Zulip: Guests can read new messages in non-subscribed public -
CVE-2026-40300
Zulip: Message edit history visible in "moves only" policy t -
CVE-2026-26058
Zulip: Path Traversal in Import -
CVE-2026-25742
Zulip: Anonymous File Access After Disabling Spectator Acces -
CVE-2026-25741
Zulip Vulnerable to Modification of Payment Method (Stripe D
Same vendor: zulip
-
CVE-2026-100404
Zulip: Guests can read new messages in non-subscribed public -
CVE-2026-40300
Zulip: Message edit history visible in "moves only" policy t -
CVE-2026-26058
Zulip: Path Traversal in Import -
CVE-2026-25742
Zulip: Anonymous File Access After Disabling Spectator Acces -
CVE-2026-25741
Zulip Vulnerable to Modification of Payment Method (Stripe D
Same weakness: CWE-287
-
CVE-2026-109506
Improper Authentication in Multiple TP-Link WiFi Repeaters -
CVE-2026-107350
Authentication bypass via second StartupMessage during SCRAM -
CVE-2026-101954
Junos OS and Junos OS Evolved: Unauthenticated network acces -
CVE-2026-101986
Junos OS and Junos OS Evolved: J-Web permits pre-authenticat -
CVE-2026-101956
Junos OS: Unauthorized root command execution when J-Web is
V. Comments for CVE-2026-102893
No comments yet