CVE-2026-74978

Analyzed Analyzed - Analysis Complete

Clickjacking in Firefox Widget Component

Publication date: 2026-08-18

Last updated on: 2026-08-25

Assigner: Mozilla Corporation

Description

Clickjacking issue in the Widget component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-18

Last Modified

2026-08-25

Generated

2026-09-07

AI Q&A

2026-08-18

EPSS Evaluated

2026-09-06

NVD

CVE-2026-74978

EUVD

EUVD-2026-60691

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	to 153.1.0 (exc)
mozilla	thunderbird	to 153.1.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-1021	The web application does not restrict or incorrectly restricts frame objects or UI layers that belong to another application or domain, which can lead to user confusion about which interface the user is interacting with.

Attack-Flow Graph

Executive Summary

This is a clickjacking vulnerability in Firefox's Widget component. Clickjacking occurs when an attacker tricks a user into clicking something different from what the user perceives, potentially allowing unauthorized actions.

Detection Guidance

Detection involves checking Firefox and Firefox ESR versions. Run 'firefox --version' or 'firefox-esr --version' to verify if versions are below 154 or 153.1 respectively.

Impact Analysis

An attacker could exploit this to trick you into clicking UI elements without your knowledge, leading to unintended actions like enabling camera access, downloading malware, or changing settings.

Compliance Impact

This vulnerability does not directly affect compliance with GDPR or HIPAA as it is a clickjacking issue in a specific software component. Compliance depends on broader security controls and data protection measures rather than this single vulnerability.

Mitigation Strategies

Update Firefox to version 154 or Firefox ESR to version 153.1 or later immediately to patch the clickjacking vulnerability.

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