CVE-2026-18209

Katalog CVE

CVSS 4.7 · Medium EPSS 0,41%

Kerentanan Improper Validation of Consistency within Input pada redhat build of keycloak. Skor CVSS 3.1 4.7 (Medium) menurut NVD.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

31 Juli 2026

Terakhir diubah

16 September 2026

Status NVD

Modified

CVSS 3.1

4.7 (Medium), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-1288: Improper Validation of Consistency within Input

EPSS (30 hari)

0,41% peluang dieksploitasi; lebih tinggi dari 33,2% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://access.redhat.com/security/cve/CVE-2026-18209 advisory vendor
• https://bugzilla.redhat.com/show_bug.cgi?id=2508305 issue tracking · advisory vendor
• https://access.redhat.com/errata/RHSA-2026:68277
• https://access.redhat.com/errata/RHSA-2026:68278