Description (CNA)
A flaw was found in the keycloak-services component of Keycloak, which handles OpenID Connect (OIDC) authentication flows. The issue occurs because the security check designed to prevent HTTP parameter pollution only inspects the query portion of a redirect URL and ignores the fragment portion. When a client is configured with a wildcard redirect URI, an attacker can use this to inject duplicate security parameters into the login response. If a client application is not configured correctly, it might trust the attacker's injected data instead of the real security information from Keycloak, leading to session fixation or account confusion.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Red Hat / Red Hat build of Keycloak 26.6 | unaffected 26.6.7-3 before * |
| Red Hat / Red Hat build of Keycloak 26.6 | unaffected 26.6-20 before * |
| Red Hat / Red Hat build of Keycloak 26.6 | unaffected 26.6-20 before * |
| Red Hat / Red Hat build of Keycloak 26.6.7 | unaffected |
| Red Hat / Red Hat build of Keycloak 26.6.7 | unaffected |
| Red Hat / Red Hat build of Keycloak 26.6.7 | unaffected |
| Red Hat / Red Hat Data Grid 8 | unaffected |
| Red Hat / Red Hat JBoss Enterprise Application Platform Expansion Pack | unaffected |
| Red Hat / Red Hat Single Sign-On 7 | unaffected |
CWE
CWE-1288
References
- https://access.redhat.com/errata/RHSA-2026:68277
- https://access.redhat.com/errata/RHSA-2026:68278
- https://access.redhat.com/security/cve/CVE-2026-18209
- https://bugzilla.redhat.com/show_bug.cgi?id=2508305
ADP enrichment
No English description supplied.
No references supplied.