CVE-2026-16405
Received Received - Intake

Information Disclosure in Firefox WebSockets

Publication date: 2026-07-21

Last updated on: 2026-07-21

Assigner: Mozilla Corporation

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

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Meta Information

Published
2026-07-21
Last Modified
2026-07-21
Generated
2026-07-21
AI Q&A
2026-07-21
EPSS Evaluated
N/A
NVD
CVE-2026-16405
EUVD
EUVD-2026-46243

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
mozilla firefox to 153 (inc)
mozilla firefox_esr to 140.13 (inc)
mozilla firefox 153
mozilla firefox_esr 140.13

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability is an information disclosure issue in the Networking: WebSockets component of Firefox. It was patched in Firefox version 153 and Firefox ESR version 140.13.

Impact Analysis

An attacker could exploit this flaw to access sensitive information transmitted over WebSockets in Firefox. This may lead to unauthorized data exposure if the affected versions are used.

Compliance Impact

The provided CVE data does not specify the nature of the information disclosure or its impact on compliance standards like GDPR or HIPAA. Without details on what data is exposed or how it is handled, it is unclear how this vulnerability would affect compliance.

Mitigation Strategies

Update Firefox to version 153 or later and Firefox ESR to version 140.13 or later to address the information disclosure vulnerability in the WebSockets component.

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