CVE-2026-109751
Received Received - Intake

Information Disclosure in Firefox Networking Component

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: Mozilla Corporation

Description
Information disclosure in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

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Meta Information

Published
2026-10-13
Last Modified
2026-10-13
Generated
2026-10-19
AI Q&A
2026-10-13
EPSS Evaluated
2026-10-18
NVD
CVE-2026-109751
EUVD
EUVD-2026-98513

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
mozilla firefox to 158 (inc)
mozilla firefox_esr to 153.5 (inc)
mozilla firefox 158
mozilla firefox_esr 153.5

Helpful Resources

Exploitability

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

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Executive Summary

This vulnerability is an information disclosure issue in the Networking component of Firefox. It allows unauthorized access to sensitive data due to improper handling of network requests. The flaw was addressed in Firefox 158 and Firefox ESR 153.5.

Detection Guidance

This vulnerability is an information disclosure issue in Firefox's Networking component, fixed in Firefox 158 and Firefox ESR 153.5. To detect it, check your Firefox version using about:support in the browser or run 'firefox --version' in the terminal. If your version is below 158 (or 153.5 for ESR), the system is vulnerable.

Impact Analysis

An attacker could exploit this to leak sensitive information from your browser sessions. This might include credentials, cookies, or other private data transmitted over the network. Users should update to the patched versions immediately.

Compliance Impact

The vulnerability allows information disclosure, which could lead to unauthorized access to sensitive data. This may impact compliance with GDPR (data protection) and HIPAA (health data privacy) by increasing the risk of data breaches.

Mitigation Strategies

Update Firefox to version 158 or later and Firefox ESR to version 153.5 or later to address the information disclosure vulnerability in the Networking component.

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