ACLs don’t

The ACL model is unable to make correct access decisions for interactions involving more than
two principals, since required information is not retained across message sends. Though this
deficiency has long been documented in the published literature, it is not widely understood. This
logic error in the ACL model is exploited by both the clickjacking and Cross-Site Request
Forgery attacks that affect many Web applications.

Source: http://www.hpl.hp.com/techreports/2009/HPL-2009-20.pdf

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