Information Disclosure in Firefox Networking Component Prior to

Publication date: 2026-01-13

Last updated on: 2026-04-13

Assigner: Mozilla Corporation

Description

Information disclosure in the Networking component. This vulnerability was fixed in Firefox 147, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-01-13

Last Modified

2026-04-13

Generated

2026-07-06

AI Q&A

2026-01-14

EPSS Evaluated

2026-07-05

NVD

CVE-2026-0883

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	to 147 (exc)
mozilla	firefox_esr	to 140.7 (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 flaw in the Networking component of Firefox versions prior to 147 and Firefox ESR versions prior to 140.7. It allows attackers to gain access to information that should be protected, potentially exposing sensitive data.

Impact Analysis

The vulnerability can lead to unauthorized disclosure of information within the browser, which may expose sensitive user data or browsing information to attackers. This could compromise user privacy and security but does not directly allow code execution or system control.

Mitigation Strategies

To mitigate this vulnerability, update Firefox to version 147 or later, or Firefox ESR to version 140.7 or later, as these versions include fixes addressing this issue and other related security vulnerabilities. [1, 2]

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