CVE-2026-55957

HIGH

Apache Tomcat: Authentication bypass with JNDIRealm and GSSAPI authenticated bind

Title source: cna
STIX 2.1

Description

Missing Critical Step in Authentication vulnerability in Apache Tomcat when the JNDIRealm was configured to authenticate binds using GSSAPI allowed attackers to authenticate without provided the correct password. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.4, from 10.1.0-M1 through 10.1.36, from 9.0.0.M1 through 9.0.100, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Users are recommended to upgrade to version 11.0.5, 10.1.37 or 9.0.101, which fixes the issue.

References (2)

Core 2

Scores

CVSS v3 7.3
EPSS 0.0046
EPSS Percentile 37.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact total

Details

CWE
CWE-304
Status published
Products (7)
apache/tomcat < 9.0.101
Apache Software Foundation/Apache Tomcat < 7.0.0
Apache Software Foundation/Apache Tomcat 10.1.0-M1 - 10.1.36
Apache Software Foundation/Apache Tomcat 11.0.0-M1 - 11.0.4
Apache Software Foundation/Apache Tomcat 7.0.0 - 7.0.109
Apache Software Foundation/Apache Tomcat 8.5.0 - 8.5.100
Apache Software Foundation/Apache Tomcat 9.0.0.M1 - 9.0.100
Published Jun 29, 2026
Tracked Since Jun 30, 2026