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Fencer Vulns
high 7.4

CVE-2026-15554 json

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

published 2026-08-11 2 mo ago modified 2026-11-01 8 d ago also EUVD-2026-55981

cvss
7.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 41%
public exploits
0
none known

Summary

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.

Patch / fix

  • Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 0:1.5.26-2.Final_redhat_00001.1.el7eap, 0:1.10.0-46.Final_redhat_00044.1.el7eap, 0:2.2.40-2.SP3_redhat_00001.1.el7eap, 0:2.3.14-11.SP11_redhat_00001.1.el7eap, 0:2.5.5-24.SP12_redhat_00016.1.el7eap, 0:2.5.5-30.SP12_redhat_00020.1.el7eap, 0:2.16.0-22.redhat_00057.1.el7eap, 0:2.18.8-1.redhat_00003.1.el7eap, 0:4.1.135-1.Final_redhat_00001.1.el7eap, 0:5.0.31-3.SP2_redhat_00001.1.el7eap, 0:7.4.25-2.GA_redhat_00001.1.el7eap
  • Red Hat Red Hat JBoss Enterprise Application Platform 8.1.8.GA 2.3.26.SP3-redhat-00001
  • Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 0:1.2.7-1.redhat_00002.1.el10eap, 0:1.85.0-1.redhat_00001.1.el10eap, 0:2.0.5-1.Final_redhat_00001.1.el10eap, 0:2.1.0-1.redhat_00001.1.el10eap, 0:2.2.0-1.Final_redhat_00001.1.el10eap, 0:2.18.9-1.redhat_00003.1.el10eap, 0:2.40.0-8.redhat_00024.1.el10eap, 0:3.0.1-1.Final_redhat_00001.1.el10eap, 0:3.0.22-1.Final_redhat_00001.1.el10eap, 0:3.1.0-1.Final_redhat_00001.1.el10eap, 0:3.6.3-1.Final_redhat_00001.1.el10eap, 0:4.0.5-1.redhat_00001.1.el10eap, 0:4.0.7-4.redhat_00001.1.el10eap, 0:4.1.5-5.redhat_00008.1.el10eap, 0:4.1.7-1.SP1_redhat_00001.1.el10eap, 0:5.0.31-1.SP2_redhat_00001.1.el10eap, 0:5.1.0-1.Final_redhat_00001.1.el10eap, 0:6.6.54-1.Final_redhat_00001.1.el10eap, 0:7.4.0-1.Final_redhat_00001.1.el10eap, 0:801.8.0-1.GA_redhat_00001.1.el10eap
  • Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 0:1.2.7-1.redhat_00002.1.el8eap, 0:1.85.0-1.redhat_00001.1.el8eap, 0:2.0.5-1.Final_redhat_00001.1.el8eap, 0:2.1.0-1.redhat_00001.1.el8eap, 0:2.2.0-1.Final_redhat_00001.1.el8eap, 0:2.18.9-1.redhat_00003.1.el8eap, 0:2.40.0-8.redhat_00024.1.el8eap, 0:3.0.1-1.Final_redhat_00001.1.el8eap, 0:3.0.22-1.Final_redhat_00001.1.el8eap, 0:3.1.0-1.Final_redhat_00001.1.el8eap, 0:3.6.3-1.Final_redhat_00001.1.el8eap, 0:4.0.5-1.redhat_00001.1.el8eap, 0:4.0.7-4.redhat_00001.1.el8eap, 0:4.1.5-5.redhat_00008.1.el8eap, 0:4.1.7-1.SP1_redhat_00001.1.el8eap, 0:5.0.31-1.SP2_redhat_00001.1.el8eap, 0:5.1.0-1.Final_redhat_00001.1.el8eap, 0:6.6.54-1.Final_redhat_00001.1.el8eap, 0:7.4.0-1.Final_redhat_00001.1.el8eap, 0:801.8.0-1.GA_redhat_00001.1.el8eap
  • Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 0:1.2.7-1.redhat_00002.1.el9eap, 0:1.85.0-1.redhat_00001.1.el9eap, 0:2.0.5-1.Final_redhat_00001.1.el9eap, 0:2.1.0-1.redhat_00001.1.el9eap, 0:2.2.0-1.Final_redhat_00001.1.el9eap, 0:2.18.9-1.redhat_00003.1.el9eap, 0:2.40.0-8.redhat_00024.1.el9eap, 0:3.0.1-1.Final_redhat_00001.1el9eap, 0:3.0.22-1.Final_redhat_00001.1.el9eap, 0:3.1.0-1.Final_redhat_00001.1.el9eap, 0:3.6.3-1.Final_redhat_00001.1.el9eap, 0:4.0.5-1.redhat_00001.1.el9eap, 0:4.0.7-4.redhat_00001.1.el9eap, 0:4.1.5-5.redhat_00008.1.el9eap, 0:4.1.7-1.SP1_redhat_00001.1.el9eap, 0:5.0.31-1.SP2_redhat_00001.1.el9eap, 0:5.1.0-1.Final_redhat_00001.1.el9eap, 0:6.6.54-1.Final_redhat_00001.1.el9eap, 0:7.4.0-1.Final_redhat_00001.1.el9eap, 0:801.8.0-1.GA_redhat_00001.1.el9eap
  • eap8-jaxb jboss enterprise application platform 8.1 4.0.7-4.redhat_00001.1.el10eap
  • eap8-txw2 jboss enterprise application platform 8.1 4.0.7-4.redhat_00001.1.el10eap
  • eap8-xsom jboss enterprise application platform 8.1 4.0.7-4.redhat_00001.1.el10eap
  • eap8-log4j jboss enterprise application platform 8.1 2.25.4-1.redhat_00003.1.el10eap
  • eap8-netty jboss enterprise application platform 8.1 4.1.136-1.Final_redhat_00001.1.el10eap
  • eap8-rngom jboss enterprise application platform 8.1 4.0.7-4.redhat_00001.1.el10eap
  • eap8-slf4j jboss enterprise application platform 8.1 2.0.18-1.redhat_00001.1.el10eap
  • eap8-neethi jboss enterprise application platform 8.1 3.2.2-1.redhat_00001.1.el10eap

red hat advisories RHSA-2026:70230RHSA-2026:70229RHSA-2026:70228RHSA-2026:53645RHSA-2026:53646RHSA-2026:53644

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-15554 updated cvss 7.4

undertow-core: Undertow: Authentication Bypass via AJP ssl_cert/is_ssl Forgery

  • Red Hat JBoss EAP 7.4 ELS for RHEL 7 Server eap7-wildfly 7.4.25-2.GA_redhat_00001.1.el7eap, eap7-jackson-core 2.18.8-1.redhat_00003.1.el7eap, eap7-netty 4.1.135-1.Final_redhat_00001.1.el7eap, eap7-undertow 2.2.40-2.SP3_redhat_00001.1.el7eap, eap7-jackson-databind 2.18.8-1.redhat_00003.1.el7eap, eap7-netty-all 4.1.135-1.Final_redhat_00001.1.el7eap, +78 more
    fixed: vendor fix RHSA-2026:53644
  • Red Hat JBoss EAP 8.1 for RHEL 8 eap8-jaxb 4.0.7-4.redhat_00001.1.el8eap, eap8-txw2 4.0.7-4.redhat_00001.1.el8eap, eap8-xsom 4.0.7-4.redhat_00001.1.el8eap, eap8-rngom 4.0.7-4.redhat_00001.1.el8eap, eap8-log4j 2.25.4-1.redhat_00003.1.el8eap, eap8-neethi 3.2.2-1.redhat_00001.1.el8eap, +101 more
    fixed: vendor fix RHSA-2026:70228
  • Red Hat JBoss EAP 8.1 for RHEL 9 eap8-jaxb 4.0.7-4.redhat_00001.1.el9eap, eap8-txw2 4.0.7-4.redhat_00001.1.el9eap, eap8-xsom 4.0.7-4.redhat_00001.1.el9eap, eap8-rngom 4.0.7-4.redhat_00001.1.el9eap, eap8-log4j 2.25.4-1.redhat_00003.1.el9eap, eap8-neethi 3.2.2-1.redhat_00001.1.el9eap, +101 more
    fixed: vendor fix RHSA-2026:70229
  • Red Hat JBoss EAP 8.1 for RHEL 10 eap8-jaxb 4.0.7-4.redhat_00001.1.el10eap, eap8-txw2 4.0.7-4.redhat_00001.1.el10eap, eap8-xsom 4.0.7-4.redhat_00001.1.el10eap, eap8-rngom 4.0.7-4.redhat_00001.1.el10eap, eap8-log4j 2.25.4-1.redhat_00003.1.el10eap, eap8-neethi 3.2.2-1.redhat_00001.1.el10eap, +100 more
    fixed: vendor fix RHSA-2026:70230
  • Red Hat JBoss Enterprise Application Platform 7.4.25
    fixed: vendor fix RHSA-2026:53806
  • Red Hat JBoss Enterprise Application Platform 8.1.8.GA undertow-core 2.3.26.SP3-redhat-00001
    fixed: vendor fix RHSA-2026:70277
  • Red Hat JBoss Enterprise Application Platform 8.1.8.GA pom.xml, aesh 2.4, c3 0.6.4, d3 7.4.3, he 1.2.0, lr 1.4.2, +1868 more
    not affected: vulnerable code not present
  • Red Hat JBoss Enterprise Application Platform Expansion Pack undertow-core
    not affected: inline mitigations already exist

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
2 mo ago

Exploit prediction

0.48% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

  • Red Hat Red Hat JBoss Enterprise Application Platform 7.4.25
  • Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
  • Red Hat Red Hat JBoss Enterprise Application Platform 8.1.8.GA
  • Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
  • Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
  • Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
  • Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack

Classification

Weakness
  • CWE-295 Improper Certificate Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.