Security Advisory

CVE-2026-9704

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2026-05-27 12:56:00

Last updated 2026-05-27 15:29:26

Assigner redhat

State PUBLISHED

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 clients service account, leading to privilege escalation.

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