CVE-2026-16405

Information disclosure in the Networking: WebSockets component

High · published July 21, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
16.3
In the wild
Unconfirmed
What it is

Information disclosure in the Networking: WebSockets component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00256 · 16.3th percentile
Published
2026-07-21T12:38Z
EPSS history
Timeline
  • 21 JUL 12:38Z
    Information disclosure in the Networking: WebSockets component
    cvelistv5