CVE-2026-16405

HIGH

Information disclosure in the Networking: WebSockets component

Title source: cna
STIX 2.1

Description

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

References (5)

Core 5

Scores

CVSS v3 7.5
EPSS 0.0026
EPSS Percentile 17.2%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-200
Status published
Products (6)
mozilla/firefox < 153.0.0
mozilla/firefox 140.1.0 - 140.13.0
Mozilla/Firefox 140.13 - 140.*
Mozilla/Firefox 153
Mozilla/Thunderbird 140.13 - 140.*
Mozilla/Thunderbird 153
Published Jul 21, 2026
Tracked Since Jul 21, 2026