PasswordPusher v1.45.11 through v2.9.5 allows unauthenticated deletion of anonymous pushes due to a nil==nil ownership-check bypass (CWE-863). The deletion guard evaluates (@push.user == current_user) || @push.deletable_by_viewer. For anonymous pushes, @push.user is nil; for unauthenticated requests, current_user is nil. Ruby evaluates nil==nil as true, so the ownership check passes and the deletable_by_viewer=false restriction is completely bypassed. Anyone who knows the secret URL token can permanently expire an anonymous push without any credentials.
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