Advisoriesby IbisRed HatCVE-2026-19607
Red Hat first-broker-login flow: improper authentication
No fix yet
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 versions
| Package | Affected | Fixed in |
|---|---|---|
| Red Hat Single Sign-On 7 Product | all versions | No fix yet |
| Red Hat build of Keycloak 26.4.16 Product | all versions | No fix yet |
| all versions | No fix yet | |
| Red Hat build of Keycloak 26.6.7 Product | all versions | No fix yet |
| all versions | No fix yet |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-287
- www.cve.org/CVERecord?id=CVE-2026-19607
- nvd.nist.gov/vuln/detail/CVE-2026-19607
- access.redhat.com/errata/RHSA-2026:68276
- access.redhat.com/errata/RHSA-2026:68277
- access.redhat.com/errata/RHSA-2026:68278
- access.redhat.com/errata/RHSA-2026:68280
- access.redhat.com/security/cve/CVE-2026-19607
- bugzilla.redhat.com/show_bug.cgi?id=2514529