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CVE-2026-19607

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

Published: Sep 16, 2026Updated: Sep 16, 2026 Sources: CVE List NVDCWE-287
5.3MEDIUM
NVD MITRE
EPSS Score
0.5%
Top 59.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:LAvailability
Low
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Weaknesses

CWE-287

Affected Products

Red Hat
commercial·US
Red Hat build of Keycloak 26.4On-premWeb App
Web & CMS Plugins
Red Hat build of Keycloak 26.4.16On-prem
Operating Systems / linux-distro
Red Hat build of Keycloak 26.6On-prem
Security Products / identity-access-mgmt
Red Hat build of Keycloak 26.6.7On-prem
Operating Systems / linux-distro
Red Hat Single Sign-On 7On-premSecurity Product
Security Products / identity-access-mgmt

Exploitability

Workaround Available

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Initial Access
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References

https://access.redhat.com/errata/RHSA-2026:68276
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:68277
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:68278
access.redhat.com
and 3 more references View all →

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