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I have a strange problem reported by some users with various WordPress versions. I've tested this with vanilla WP 4.9.8 up to 5.1. I have no plugins activated.

Whenever I submit a textarea or input field containing <meta> I get a 404 error. I've recorded two videos for a better explanation (4.9.8 and 5.1)

I guess this is on a server level as a manipulation of the core files doesn't make any difference.

I'm not able to reproduce this on my end but can do this on my customer's server (see videos).

I get reports on this issue for around two weeks.

  • Sounds like a mod_security issue. Contact the host for assistance. – Jacob Peattie Mar 11 '19 at 10:13

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