CVE-2026-15554

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data exposure, data tampering.

Exploit odds

0.5% chance of exploitation in the next 30 days (EPSS).

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2026-08-11 09:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-11-01 01:17 UTC Last updatedMost recent change to the record

Details

Published

2026-08-11 09:17 UTC

Last modified

2026-11-01 01:17 UTC

Exploit probability

0.5% · EPSS, next 30 days

Weakness

CWE-295 · Improper certificate validation

Record status

Awaiting Analysis

Attack profile CVSS 3.1 · 7.4

Attack vector

Network

Complexity

High

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None