CVE-2026-74983: Mitigation bypass in the Data Loss Prevention component

Published Aug 18, 2026

Updated

Mitigation bypass in the Data Loss Prevention component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, and Firefox ESR 153.1.

Affected Software

4 affected componentsFixes available

Mozilla Firefox<154, <140.14, <153.1

Mozilla Firefox ESR<140.14

140.14

Mozilla Firefox<154

154

Mozilla Firefox ESR<153.1

153.1

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 140.14
Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 154
Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 153.1

Aug 18, 2026

CVE Published

via Mozilla·12:00 AM

Data Sourced

via Mozilla·12:00 AM

DescriptionSeverityAffected Software

Updated

via Mozilla·12:00 AM

Affected Software

CVE Published

via MITRE·12:23 PM

Data Sourced

via MITRE·12:23 PM

Description

This vulnerability appears in the following advisories.

Found alongside the following vulnerabilities.