CVE-2026-9704
Keycloak Vulnerable to Improper Validation of Specified Quantity in Input
6.8
MEDIUM
CVSS 3.1
EPSS 0.32%
描述
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.
如何修補 CVE-2026-9704
要修補 CVE-2026-9704,請將受影響套件升級到下列已修補版本。
- —升級至 26.6.3 或更新版本
- —升級至 26.6.3 或更新版本
CVE-2026-9704 正在被利用嗎?
低 — EPSS 為 0.3%,目前沒有觀察到大規模利用活動。
受影響套件(2)
- from 0, < 26.6.3
- from 0, < 26.6.3
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.8 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N |