CVE-2026-74974
Undergoing Analysis Undergoing Analysis - In Progress

Graphics ImageLib Same-Origin Policy Bypass in Firefox

Publication date: 2026-08-18

Last updated on: 2026-08-18

Assigner: Mozilla Corporation

Description
Same-origin policy bypass in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, 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-2026-74974
EUVD
EUVD-2026-60669

Affected Vendors & Products

Showing 8 associated CPEs
Vendor Product Version / Range
mozilla firefox From 154 (inc)
mozilla firefox_esr From 115.39 (inc)
mozilla firefox_esr From 140.14 (inc)
mozilla firefox_esr From 153.1 (inc)
mozilla firefox 154
mozilla firefox_esr 115.39
mozilla firefox_esr 140.14
mozilla firefox_esr 153.1

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Exploitability

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KEV
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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 Graphics: ImageLib component. The same-origin policy is a security feature that prevents scripts from one website from accessing data from another website unless they share the same origin. A bypass of this policy could allow malicious scripts to access sensitive data across different origins.

Detection Guidance

Detecting this vulnerability requires checking the installed Firefox version. Compare it against the fixed versions: Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, or Firefox ESR 153.1. Use commands like 'firefox --version' or check your package manager for updates.

Impact Analysis

If exploited, this vulnerability could allow attackers to steal sensitive data from other websites you visit, such as login credentials, personal information, or financial details. It could also enable unauthorized actions on your behalf on other websites, leading to potential account takeovers or data breaches.

Compliance Impact

This vulnerability could lead to unauthorized access to personal data, violating GDPR's data protection principles and potentially resulting in fines. For HIPAA, it may expose protected health information, leading to compliance violations and penalties. Organizations must ensure affected systems are patched to maintain compliance.

Mitigation Strategies

Immediately update Firefox to version 154 or Firefox ESR to versions 115.39, 140.14, or 153.1. Disable automatic image loading in browser settings if updates are delayed. Monitor Mozilla's security advisories for further guidance.

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