CVE-2026-42498

HIGH

Apache Tomcat: WebSocket authentication header exposure

Title source: cna
STIX 2.1

Description

Exposure of HTTP Authentication Header to unexpected hosts during WebSocket authentication vulnerability in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.2 through 9.0.117, from 8.5.24 through 8.5.100, from 7.0.83 through 7.0.109. Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118, which fix the issue.

References (2)

Core 2

Scores

CVSS v3 7.3
EPSS 0.0005
EPSS Percentile 15.6%
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 partial

Details

CWE
CWE-200
Status published
Products (15)
apache/tomcat 7.0.0 - 7.0.109
Apache Software Foundation/Apache Tomcat 10.1.0-M1 - 10.1.54
Apache Software Foundation/Apache Tomcat 11.0.0-M1 - 11.0.21
Apache Software Foundation/Apache Tomcat 7.0.83 - 7.0.109
Apache Software Foundation/Apache Tomcat 8.5.24 - 8.5.100
Apache Software Foundation/Apache Tomcat 9.0.2 - 9.0.117
org.apache.tomcat/tomcat 0 - 9.0.118Maven
org.apache.tomcat/tomcat 10.1.0-M1 - 10.1.55Maven
org.apache.tomcat/tomcat 11.0.0-M1 - 11.0.22Maven
org.apache.tomcat/tomcat-catalina 0 - 9.0.118Maven
... and 5 more
Published May 12, 2026
Tracked Since May 12, 2026