CVE Watch7 ago 2026

CVE-2026-18209

A flaw was found in the keycloak-services component of Keycloak, which handles OpenID Connect (OIDC) authentication flows. The issue occurs

CVSS

3.4

Bajo

EPSS

0.2%

KEV

—

Exploit Today

0-100

Publicado: 31 jul 2026 · Última mod.: 7 ago 2026 · CWE-1288

EPSS · 30d

0.2%EPSS · 30 días0.2%

2026-08-032026-08-31

Descripción técnica

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.

Referencias oficiales

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