CVE-2021-30630: 
vulnerability analysis and mitigation

CVE-2021-30630 is a security vulnerability discovered in Google Chrome's Blink engine prior to version 93.0.4577.82. The vulnerability was disclosed in September 2021 and affects the browser's renderer process. This inappropriate implementation in Blink allowed a remote attacker who had compromised the renderer process to leak cross-origin data through a crafted HTML page (Chrome Release, NVD).

The vulnerability is classified with a CVSS v3.1 Base Score of 4.3 (Medium) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N. The issue stems from an inappropriate implementation in the Blink rendering engine that could allow cross-origin data leakage when exploited. The vulnerability is categorized as CWE-346 (Origin Validation Error) (NVD).

If successfully exploited, this vulnerability could allow an attacker who has compromised the renderer process to leak cross-origin data, potentially exposing sensitive information from other origins. The impact is limited to data exposure without system modification capabilities (NVD).

Google addressed this vulnerability in Chrome version 93.0.4577.82. Users are advised to update to this version or later to mitigate the risk. The fix was included in a security update that addressed multiple vulnerabilities (Chrome Release).