Kurz gesagt
- CVE-2026-9704 ist eine Schwachstelle (HOCH (CVSS 8.8)) in org.keycloak:keycloak-server-spi-private, org.keycloak:keycloak-services.
- Wahrscheinlichkeit einer Ausnutzung in den nächsten 30 Tagen (EPSS): 0.32%, höher als bei 25.1% aller Schwachstellen.
- Abhilfe: auf 26.6.3 oder neuer aktualisieren.
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.
NVD 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.
Weitere Schwachstellen in org.keycloak:keycloak-server-spi-private
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