CVE-2026-100766
Received Received - Intake

Information Disclosure in Firefox Networking JAR Component

Publication date: 2026-09-29

Last updated on: 2026-09-29

Assigner: Mozilla Corporation

Description
Information disclosure in the Networking: JAR component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

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Meta Information

Published
2026-09-29
Last Modified
2026-09-29
Generated
2026-09-29
AI Q&A
2026-09-29
EPSS Evaluated
N/A
NVD
CVE-2026-100766
EUVD
EUVD-2026-88918

Affected Vendors & Products

Showing 6 associated CPEs
Vendor Product Version / Range
mozilla firefox 153.4
mozilla firefox 157
mozilla firefox 115.42
mozilla firefox 140.17
mozilla firefox to 153.4 (inc)
mozilla firefox to 115.42 (inc)

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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: JAR component of Firefox. It allows unauthorized access to sensitive data through the affected component.

Impact Analysis

An attacker could exploit this to access confidential information, potentially leading to data breaches or privacy violations. Users should update Firefox to a patched version immediately.

Compliance Impact

This vulnerability could lead to non-compliance with GDPR or HIPAA if it results in unauthorized data exposure. Organizations must address it to maintain regulatory compliance.

Mitigation Strategies

Update Firefox ESR to version 153.4 or later, Firefox to version 157 or later, or Firefox ESR to version 115.42 or later. If using ESR 140, update to version 140.17 or later.

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