5.3
Medium
CVE-2026-19607 A flaw was found in the first-broker-login flow of the keycloak-services component
Description
A flaw was found in the first-broker-login flow of the keycloak-services component. This component handles the initial authentication and account linking when a user logs in via an external identity provider. The issue allows an attacker to register a matching username on an external provider to trigger a collision in Keycloak, which results in the legitimate user being locked out of their account.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Red Hat build of Keycloak 26.4 26.4 | earliest → < 26.4-26 | 26.4-26 |
| Red Hat build of Keycloak 26.4.16 | Versions not published | |
| Red Hat build of Keycloak 26.6 26.6 | earliest → < 26.6-20 | 26.6-20 |
| Red Hat build of Keycloak 26.6.7 | Versions not published | |
| Red Hat Single Sign-On 7 | Versions not published |
References
- RHSA-2026:68276 access.redhat.com
- RHSA-2026:68277 access.redhat.com
- RHSA-2026:68278 access.redhat.com
- RHSA-2026:68280 access.redhat.com
- access.redhat.com access.redhat.com
- RHBZ#2514529 bugzilla.redhat.com
Timeline
- Published
- Last modified
Other CVEs of Red Hat build of Keycloak 26.4
The 116 CVEs of Red Hat build of Keycloak 26.4 →
CVE-2026-97848
Keycloak-services: keycloak-services: protocol mapper with jsontype=json bypasses token sanitization
6.5
Medium
CVE-2026-97367
Keycloak-services: keycloak-services: dcr azp and sid claim substitution allows account rest session takeover
6.4
Medium
CVE-2026-96547
Keycloak-services: keycloak-services: dcr registration-time claim-path gap allows forging realm_access.roles
6.5
Medium
CVE-2026-97847
Keycloak-services: keycloak-services: client manager can substitute sessionless token principal via hardcoded-claim mappers to obtain realm administrator authority
7.1
High