5.3

CVE-2026-19607

Keycloak-services: keycloak-services: broker-originated username collision causes account lockout

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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerRed Hat
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Produkt Red Hat build of Keycloak 26.4
Default Statusaffected
Version 26.4.16-2
Version < *
Status unaffected
HerstellerRed Hat
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Produkt Red Hat build of Keycloak 26.4
Default Statusaffected
Version 26.4-26
Version < *
Status unaffected
HerstellerRed Hat
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Produkt Red Hat build of Keycloak 26.4
Default Statusaffected
Version 26.4-26
Version < *
Status unaffected
HerstellerRed Hat
≫
Produkt Red Hat build of Keycloak 26.4.16
Default Statusunaffected
HerstellerRed Hat
≫
Produkt Red Hat build of Keycloak 26.4.16
Default Statusunaffected
HerstellerRed Hat
≫
Produkt Red Hat build of Keycloak 26.6
Default Statusaffected
Version 26.6.7-3
Version < *
Status unaffected
HerstellerRed Hat
≫
Produkt Red Hat build of Keycloak 26.6
Default Statusaffected
Version 26.6-20
Version < *
Status unaffected
HerstellerRed Hat
≫
Produkt Red Hat build of Keycloak 26.6
Default Statusaffected
Version 26.6-20
Version < *
Status unaffected
HerstellerRed Hat
≫
Produkt Red Hat build of Keycloak 26.6.7
Default Statusunaffected
HerstellerRed Hat
≫
Produkt Red Hat build of Keycloak 26.6.7
Default Statusunaffected
HerstellerRed Hat
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Produkt Red Hat Single Sign-On 7
Default Statusunaffected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.51% 0.422
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
RedHat 5.3 3.9 1.4
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE-287 Improper Authentication

When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

https://access.redhat.com/errata/RHSA-2026:68276
https://access.redhat.com/errata/RHSA-2026:68277
https://access.redhat.com/errata/RHSA-2026:68278
https://access.redhat.com/errata/RHSA-2026:68280
https://access.redhat.com/security/cve/CVE-2026-19607
https://bugzilla.redhat.com/show_bug.cgi?id=2514529