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VULNERABILITIES

CVE-2026-16405 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: CISA-ADPCVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://bugzilla.mozilla.org/show_bug.cgi?id=2036591 [email protected]Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-68/ [email protected]Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-70/ [email protected]Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-71/ [email protected]
https://www.mozilla.org/security/advisories/mfsa2026-72/ [email protected]

Weakness Enumeration

CWE-IDCWE NameSource
CWE-200Exposure of Sensitive Information to an Unauthorized ActorCISA-ADP

Affected Products

ProductVersions
mozilla firefox
< 153.0.0
>= 140.1.0, < 140.13.0

CPE

  • cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*

Remediation

  • No remediation found in references.

Change History

4 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-16405
NVD Published Date:
Jul 21, 2026
NVD Last Modified:
Jul 22, 2026
Source:
[email protected]
CVE-2026-16405 Details - Not Deferred