Marc Schoenefeld has reported a vulnerability in Microsoft Java Virtual Machine, allowing Java applets originating from different domains to communicate.

The problem is that applets share a common class loader for the system classes, allowing sites to use public static fields for Cross-Site communication. This could potentially be exploited to cause information leakage.

This is a breach of sandbox restrictions.

The vulnerability has been reported in version 5.0.0.3810. Other versions may also be affected.

Solution
Use another Java implementation.

Provided and/or discovered by
Marc Schoenefeld

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