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Vulnerability DatabaseCVE-2025-5263

CVE-2025-5263: 
Mozilla Firefox vulnerability analysis and mitigation

Overview

CVE-2025-5263 is a security vulnerability discovered in Mozilla Firefox browsers where error handling for script execution was incorrectly isolated from web content. The vulnerability affects Firefox versions below 139, Firefox ESR versions below 115.24, and Firefox ESR versions below 128.11. This vulnerability was reported by security researcher terjanq and was disclosed on May 27, 2025 (Mozilla Advisory).

Technical details

The vulnerability is classified as a moderate severity issue with a CVSS 3.1 Base Score of 4.3 (MEDIUM). The vulnerability is categorized under CWE-346 (Origin Validation Error). The technical vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N, indicating that it is network accessible, requires low attack complexity, needs no privileges, requires user interaction, has unchanged scope, and can impact confidentiality (NVD).

Impact

The vulnerability could allow cross-origin leak attacks due to incorrect isolation of error handling for script execution from web content. This could potentially lead to information disclosure across different origins (Mozilla Advisory).

Mitigation and workarounds

The vulnerability has been fixed in Firefox 139, Firefox ESR 115.24, and Firefox ESR 128.11. Users are advised to update their browsers to these versions or newer to mitigate the risk (Mozilla Advisory).

Additional resources

Source: This report was generated using AI

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