Cross-Origin Leak Vulnerability in Firefox Browser Software by Mozilla

CVE-2025-5263

What is CVE-2025-5263?

This vulnerability arises from improper error handling in script execution, which fails to adequately isolate such processes from web content. As a result, it can potentially facilitate cross-origin leak attacks, allowing malicious entities to gain unauthorized access to sensitive information from other domains. The affected versions include Firefox below 139 and specific ESR versions, highlighting the need for immediate updates to safeguard user data and maintain secure browsing.

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