CVE-2026-74981
Undergoing Analysis Undergoing Analysis - In Progress

Site Isolation Bypass in Firefox Web Codecs

Publication date: 2026-08-18

Last updated on: 2026-08-18

Assigner: Mozilla Corporation

Description
Site isolation issue in the Audio/Video: Web Codecs 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-2026-74981
EUVD
EUVD-2026-60694

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
mozilla firefox 154
mozilla firefox_esr 153.1

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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 is a site isolation issue in Firefox's Audio/Video: Web Codecs component. Site isolation is a security feature that separates content from different websites to prevent data leaks. A flaw in this component could allow malicious websites to access data from other sites.

Impact Analysis

If exploited, this vulnerability could allow an attacker to access sensitive data from other websites you visit while using Firefox. This might include login credentials, personal information, or other confidential data.

Compliance Impact

This vulnerability could lead to unauthorized data access, potentially violating privacy regulations like GDPR or HIPAA if sensitive personal or health data is exposed. Organizations must ensure patches are applied to maintain compliance.

Mitigation Strategies

Update Firefox to version 154 or later and Firefox ESR to version 153.1 or later to address the Site isolation issue in the Audio/Video: Web Codecs component.

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