CVE-2026-9704EPSS p21.5%
CVE-2026-9704CVE-2026-9704
redhat / build_of_keycloak
Description
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.
Scoring
| CVSS | 6.8 () |
| Vector | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N |
| EPSS | 0.30% probability of exploitation · percentile 21.5% · 2026-06-19T12:03:05Z |
| Last modified | 2026-06-10 |
Related by meaning· 6
Nearest entities by semantic similarity across the cs-graph corpus.