CVE-2026-16442
High
Description
A flaw was found in the SAML broker component of Keycloak, which is used to manage identity federation and user authentication. The issue occurs because the IdP-initiated Single Sign-On endpoint fails to check if a provider is restricted to account linking only. This allows an attacker with control over a linked upstream identity to bypass login restrictions and gain full access to a local user account.
SeverityHigh
CVSS7.4
Exploit probability—
Product
Redhat Build Of Keycloak
PublishedAug 5, 2026
First seenAug 5, 2026
Weakness typeCWE-346CWE-346
How to fix
Update
- redhat build_of_keycloak26.4.14, 26.6.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| redhat build_of_keycloak | 26.4 ≤ v < 26.4.14, 26.6 ≤ v < 26.6.5 | 26.4.14, 26.6.5 |
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