[Webkit-unassigned] [Bug 241319] New: Favicon caching can be used to track users

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=241319

            Bug ID: 241319
           Summary: Favicon caching can be used to track users
           Product: WebKit
           Version: Safari 15
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: arthuredelstein at gmail.com

Cached favicons hosted on a third-party domain can be used to track users across first parties. If a third-party favicon has already been fetched and cached under first party A.com, then it won't be loaded over the network when the user visits B.com.

Please see https://privacytests.org/nightly.html and https://privacytests.org/ios.html.

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