Manual:$wgMangleFlashPolicy

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Output: $wgMangleFlashPolicy
Whether to mangle any <cross-domain-policy> (Adobe cross-domain policy) tags, to prevent XSS attacks.
Introduced in version:1.23.7 (git #92f22cd4)
Removed in version:still in use
Allowed values:(boolean)
Default value:true

Details[edit]

When this is set to true, any occurrences of <cross-domain-policy> in sanitised output will be altered to <NOT-cross-domain-policy>. Without this, an attacker can potentially send their own Adobe cross-domain policy unless it is prevented by the crossdomain.xml file at the domain root.

You should only set this to false if you have a crossdomain.xml file in the root of your website (e.g. http://example.com/crossdomain.xml).