CVE-2021-1826: 
Rocky Linux vulnerability analysis and mitigation

CVE-2021-1826 is a logic issue vulnerability discovered in Apple's WebKit component that affects multiple Apple operating systems including macOS Big Sur, iOS 14.5, iPadOS 14.5, watchOS 7.4, and tvOS 14.5. The vulnerability was fixed in updates released on April 26, 2021. When processing maliciously crafted web content, this vulnerability could lead to universal cross site scripting (Apple Support).

The vulnerability stems from a logic issue in WebKit's handling of web content. The issue was addressed by implementing improved restrictions in the affected systems. The vulnerability has a CVSS v3.1 base score of 6.1 (Medium) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N, indicating it is network exploitable, requires low attack complexity, and needs user interaction (NVD).

When successfully exploited, this vulnerability allows an attacker to perform universal cross site scripting attacks through maliciously crafted web content. This could potentially lead to the execution of arbitrary JavaScript code in the context of any website, potentially compromising user data and web session security (Apple Support).

Apple has addressed this vulnerability by implementing improved restrictions in WebKit. Users are advised to update to macOS Big Sur 11.3, iOS 14.5, iPadOS 14.5, watchOS 7.4, or tvOS 14.5 or later versions to protect against this vulnerability (Apple Support, Apple Support).