CVE-2025-12909: 
Google Chrome vulnerability analysis and mitigation

Insufficient policy enforcement in Devtools in Google Chrome prior to 140.0.7339.80 allowed a remote attacker to leak cross-origin data via Devtools. This vulnerability, identified as CVE-2025-12909, was discovered by Noam Gaash and reported on August 20, 2024. The vulnerability affects Google Chrome versions before 140.0.7339.80 and was assigned a Low severity rating by the Chromium security team (Chrome Release).

The vulnerability has been assigned a CVSS 3.1 Base Score of 5.3 (Medium) with the following vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N. This indicates that the vulnerability can be exploited over the network, requires low attack complexity, needs no privileges or user interaction, has unchanged scope, and can impact confidentiality but not integrity or availability. The vulnerability is classified under CWE-693 (Protection Mechanism Failure) (Ubuntu CVE).

The vulnerability allows remote attackers to leak cross-origin data through Chrome's Developer Tools. This could potentially lead to unauthorized access to sensitive information from different origins, compromising the web browser's same-origin policy protections (NVD).

The vulnerability has been patched in Chrome version 140.0.7339.80. Users are advised to update their Chrome browsers to this version or later to mitigate the risk. The fix was included as part of a broader security update that addressed multiple vulnerabilities (Chrome Release).