CVE-2026-11800 | BDVDB-2026-343039 Detail

Description#

A flaw was found in Keycloak. This JWT algorithm confusion vulnerability in the JWT Authorization Grant flow allows an attacker with valid client credentials to bypass signature verification. By forging an assertion, the attacker can create unauthorized access tokens. This enables the attacker to impersonate any federated user linked to the affected Identity Provider, leading to unauthorized access and potential privilege escalation.

Impact#

Weaknesses#

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Exploit#

History#

1. Version 12026-06-25Record published in the CVE List.
2. Version 22026-07-15Most recent update recorded in the CVE List.