CVE-2026-92044

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Information Disclosure in Firefox Networking HTTP

Publication date: 2026-09-15

Last updated on: 2026-10-05

Assigner: Mozilla Corporation

Description

Information disclosure in the Networking: HTTP component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, and Thunderbird 156.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-15

Last Modified

2026-10-05

Generated

2026-10-05

AI Q&A

2026-09-15

EPSS Evaluated

2026-10-04

NVD

CVE-2026-92044

EUVD

EUVD-2026-78507

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	thunderbird	From 154.0 (inc) to 156.0 (exc)
mozilla	firefox	to 153.3.0 (exc)
mozilla	firefox	From 154.0.0 (inc) to 156.0.0 (exc)
mozilla	thunderbird	to 153.3.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-200	The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

Attack-Flow Graph

Executive Summary

This vulnerability is an information disclosure issue in the Networking: HTTP component of Firefox and Firefox ESR. It was addressed in Firefox version 156 and Firefox ESR version 153.3.

Detection Guidance

This vulnerability is fixed in Firefox 156, Firefox ESR 153.3, and Thunderbird 156. To detect if your system is vulnerable, check the installed version of Firefox or Thunderbird. If the version is below 156 for Firefox or Thunderbird, or below 153.3 for Firefox ESR, the system is likely vulnerable. Use commands like 'firefox --version' or 'thunderbird --version' to check the installed version.

Impact Analysis

An attacker could exploit this to access sensitive information transmitted over HTTP, potentially leading to data leaks or unauthorized access to user data.

Compliance Impact

This vulnerability could lead to non-compliance with GDPR or HIPAA if it results in unauthorized disclosure of personal or protected health information.

Mitigation Strategies

Update Firefox to version 156 or later and Firefox ESR to version 153.3 or later to address the information disclosure vulnerability.

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