CVE-2026-74966
Undergoing Analysis Undergoing Analysis - In Progress

Information Disclosure in Firefox Form Autofill

Publication date: 2026-08-18

Last updated on: 2026-08-18

Assigner: Mozilla Corporation

Description
Information disclosure in the Form Autofill component. This vulnerability was fixed in Firefox 154 and Firefox ESR 153.1.

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Meta Information

Published
2026-08-18
Last Modified
2026-08-18
Generated
2026-08-18
AI Q&A
2026-08-18
EPSS Evaluated
N/A
NVD
CVE-2026-74966
EUVD
EUVD-2026-60686

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
mozilla firefox to 154 (inc)
mozilla firefox_esr to 153.1 (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 Firefox's Form Autofill component. It was patched in Firefox 154 and Firefox ESR 153.1. The flaw allowed sensitive data to be exposed unintentionally through the autofill feature.

Detection Guidance

This vulnerability is specific to Firefox versions before 154 and Firefox ESR before 153.1. Check your Firefox version via Help > About Firefox in the application or run `firefox --version` in the terminal. If your version is below 154 (or 153.1 for ESR), the system is vulnerable.

Impact Analysis

If exploited, this vulnerability could allow attackers to access personal or sensitive information stored in autofill fields, such as addresses, credit card details, or login credentials. Users of affected Firefox versions are at risk until they update.

Compliance Impact

This vulnerability could lead to non-compliance with GDPR or HIPAA if it results in unauthorized access to protected personal data. Organizations using vulnerable Firefox versions may face legal penalties or data breach notifications.

Mitigation Strategies

Update Firefox to version 154 or later and Firefox ESR to version 153.1 or later. Disable the Form Autofill feature in Firefox settings if an update is not immediately possible. Restart the browser after making changes.

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