CVE-2026-19607Medium· 5.3▾ TwilightPoC availableA 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…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 29.2 · likelihood 0.1 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Public exploit / PoC code seen in 1 source. Availability, not in-the-wild use.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Sep 19.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.5%
1 GitHub repo
0.5% → 0.7%
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.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-17526High· 7.2Keycloak is an open-source identity and access management solution
CVE-2026-18212High· 7.5A flaw was found in the SAML Redirect Binding implementation of Keycloak, an open-source identity and access management solution
CVE-2026-79651High· 7.5A flaw was found in the theme localization endpoints of the keycloak-services component, which is the core service responsible for authentication flows and theme management in Keycloak
CVE-2026-19729Medium· 4.9A flaw was found in the key provider component of the keycloak-services library, which is the core engine for the Red Hat Build of Keycloak
CVE-2026-79652Medium· 5.9A flaw was found in the JWT Bearer authorization grant implementation within the keycloak-services component of Red Hat Build of Keycloak
CVE-2025-0604Medium· 5.4A flaw was found in Keycloak