CVE-2026-74967
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Same-origin policy bypass in Firefox Audio/Video Playback

Publication date: 2026-08-18

Last updated on: 2026-08-18

Assigner: Mozilla Corporation

Description
Same-origin policy bypass in the Audio/Video: Playback 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-2026-74967
EUVD
EUVD-2026-60664

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 From 154 (inc)
mozilla firefox_esr From 140.14 (inc)
mozilla firefox_esr From 153.1 (inc)

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability is a same-origin policy bypass in Firefox's Audio/Video Playback component. The same-origin policy is a security feature that restricts how documents or scripts from one origin interact with resources from another origin. A bypass means attackers could potentially access or manipulate data across different origins, violating expected security boundaries.

Impact Analysis

If exploited, this vulnerability could allow attackers to access sensitive data from other websites you visit, perform unauthorized actions on your behalf, or intercept communications. Users of affected Firefox versions could be at risk of data theft, session hijacking, or other malicious activities without their knowledge.

Compliance Impact

This vulnerability could lead to unauthorized access to personal or sensitive data, violating GDPR's data protection principles and HIPAA's requirements for safeguarding protected health information. Organizations using affected Firefox versions may face compliance violations, legal penalties, or reputational damage if exploited.

Mitigation Strategies

Update Firefox to version 154 or later, Firefox ESR to version 140.14 or later, or Firefox ESR to version 153.1 or later to address the same-origin policy bypass in the Audio/Video: Playback component.

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