CVE-2026-74983
Received Received - Intake

Mitigation Bypass in Firefox Data Loss Prevention

Publication date: 2026-08-18

Last updated on: 2026-08-18

Assigner: Mozilla Corporation

Description
Mitigation bypass in the Data Loss Prevention component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, 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-2026-74983
EUVD
EUVD-2026-60671

Affected Vendors & Products

Showing 6 associated CPEs
Vendor Product Version / Range
mozilla firefox to 154 (inc)
mozilla firefox_esr to 140.14 (inc)
mozilla firefox_esr to 153.1 (inc)
mozilla firefox 154
mozilla firefox_esr 140.14
mozilla firefox_esr 153.1

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a mitigation bypass vulnerability in Firefox's Data Loss Prevention component. It allows attackers to bypass security measures designed to prevent unauthorized data transfers.

Detection Guidance

Detection requires checking Firefox version. Compare installed version against Firefox 154, Firefox ESR 140.14, or Firefox ESR 153.1. Commands: Firefox about:support or system package manager version check.

Impact Analysis

An attacker could exploit this to exfiltrate sensitive data despite DLP protections. Users of affected Firefox versions risk unauthorized data leaks.

Compliance Impact

This vulnerability could lead to non-compliance with GDPR, HIPAA, or other regulations requiring strict data protection controls. Organizations may face penalties for failing to prevent data breaches.

Mitigation Strategies

Update Firefox to version 154 or Firefox ESR to 140.14 or 153.1 immediately. Disable Data Loss Prevention component if update not possible.

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