CVE-2011-4689

CVE-2011-4689 describes a vulnerability in Microsoft Internet Explorer versions 6 through 9, where an attacker could determine if a document exists in the browser cache. This is achieved by exploiting a timing side-channel during IFRAME loading attempts, which reveals Same Origin Policy violations. The vulnerability has a CVSS score of 5.0, indicating a medium severity, and allows for information disclosure (C:P) with low attack complexity (AC:L) and no authentication required (Au:N). There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.