Bug 2480172 (CVE-2026-9087) - CVE-2026-9087 keycloak: Cross-Session Email Verification Proof Not Bound to Upstream Identity in First-Broker-Login
Summary: CVE-2026-9087 keycloak: Cross-Session Email Verification Proof Not Bound to U...
Keywords:
Status: NEW
Alias: CVE-2026-9087
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-05-20 14:55 UTC by OSIDB Bzimport
Modified: 2026-05-20 14:57 UTC (History)
10 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-05-20 14:55:23 UTC 
A flaw was found in Keycloak. The cross-session verification proof is keyed only by (local userId,
idpAlias) and is not bound to the upstream identity that was actually verified, so a second upstream account on the same IdP can consume it and get linked to the victim's local account.
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