Is CVE-2026-15554 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-15554?

CVE-2026-15554 has a CVSS v3 severity of HIGH (7.4).

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CVE-2026-15554

Description

the Undertow AJP listener honours forged ssl_cert and is_ssl AJP attributes without requiring any shared-secret authentication. This enables an unauthenticated attacker with direct TCP access to port 8009 to bypass CLIENT-CERT authentication by injecting a forged X.509 certificate via the AJP protocol.