@GossiTheDog yeah is for another article about this I have read that seems to poise that RCE was established saying TA used an old CVE but am suspicious of it bec. of the txt file proof. That being said the existing "?a" parameter in Archive.org that was archived around 2 minutes after the "?mail" and before the "?x", so it is in between of the 2 proofs and based from its timestamp disproves that the actual x.txt itself doesn't exist and the parameters are more likely related to web caching.