Is CVE-2026-9704 actively exploited?

No active exploitation of CVE-2026-9704 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-9704 be exploited remotely?

Yes. CVE-2026-9704 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-9704?

CVE-2026-9704 has a CVSS score of 6.8 (MEDIUM).

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MEDIUM

CVE-2026-9704

CWE-1284Published: May 27, 2026· Updated: May 27, 2026

6.8

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:11.4th

Official 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 Source

Technical Analysis

CVE-2026-9704 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 6.8.