CVE-2026-9704

Katalog CVE

CVSS 8.8 · High EPSS 0,59%

Kerentanan Improper Validation of Specified Quantity in Input pada redhat build of keycloak. Skor CVSS 3.1 8.8 (High) menurut NVD.

Deskripsi (NVD)

A flaw was found in Keycloak. An authenticated user with low privileges can exploit this vulnerability by sending an oversized subject_token JSON Web Token (JWT) to the TokenEndpoint. When the token exceeds a 4000-character limit, it is silently dropped, causing the system to fall back to client credentials. This allows the user to gain the permissions of the client's service account, leading to privilege escalation.

Rincian

Terbit di NVD

27 Mei 2026

Terakhir diubah

26 Juni 2026

Status NVD

Modified

CVSS 3.1

8.8 (High), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-1284: Improper Validation of Specified Quantity in Input

EPSS (30 hari)

0,59% peluang dieksploitasi; lebih tinggi dari 46,6% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://access.redhat.com/security/cve/CVE-2026-9704 mitigasi · advisory vendor
• https://bugzilla.redhat.com/show_bug.cgi?id=2481877 issue tracking · advisory vendor
• https://access.redhat.com/errata/RHSA-2026:25097
• https://access.redhat.com/errata/RHSA-2026:25098
• https://access.redhat.com/errata/RHSA-2026:30049
• https://access.redhat.com/errata/RHSA-2026:30050