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CVE-2026-15554

Undertow-core: undertow: authentication bypass via ajp ssl_cert/is_ssl forgery

Published: Aug 11, 2026Updated: Sep 22, 2026 Sources: CVE List NVDCWE-295
7.4HIGH
NVD MITRE
EPSS Score
0.3%
Top 72.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:HI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-295

Affected Products

Red Hat
commercial·US
Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7On-prem
Enterprise Software / erp
Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8On-prem
Enterprise Software / erp
Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9On-prem
Enterprise Software / erp
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10On-prem
Operating Systems / linux-distro
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8On-prem
Operating Systems / linux-distro
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9On-prem
Operating Systems / linux-distro
Red Hat JBoss Enterprise Application Platform Expansion PackOn-premOS
Operating Systems / linux-distro

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Collection
View detailed technique mapping

References

https://access.redhat.com/errata/RHSA-2026:53644
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:53645
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:53646
access.redhat.com
and 6 more references View all →

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