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CVE WatchSep 25, 2026

CVE-2026-97846

Keycloak provides a feature called mTLS holder-of-key binding which ensures that a token can only be used by the client that originally requ

CVSS

6.8

Medium

EPSS

—

KEV

—

Exploit Today

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0-100

Published: Sep 25, 2026 · Last modified: Sep 25, 2026 · CWE-287

EPSS · 30d

Not enough EPSS history yet.

Technical description

Keycloak provides a feature called mTLS holder-of-key binding which ensures that a token can only be used by the client that originally requested it by binding it to their digital certificate. A flaw was discovered where the new Standard Token Exchange V2 feature does not check for this certificate. This allows an attacker with stolen client credentials to obtain a standard, unrestricted token that bypasses these security protections.

Official references
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