CVE-2026-42498CWE-200

Apache Tomcat: WebSocket authentication header exposure

High · published May 12, 2026

CVSS v3.1
7.3
EPSS
1%
Percentile
50.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.3 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CVSS v4.0
Not supplied
EPSS
0.00646 · 50.3th percentile
Weakness
CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor
Published
2026-05-12T15:17Z
EPSS history
Timeline
  • 12 MAY 15:17Z
    Apache Tomcat: WebSocket authentication header exposure
    cvelistv5