Blog post on wordpress.org concerning this: https://wordpress.org/news/2024/10/secure-custom-fields/
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Though, Automattic posted publicly that there was a vulnerability shortly after filing the CVE, while simultaneously blocking WPEngine from being able to push a fix to it because they'd cut off access to wp.org
Similarly, this is all to resolve the personal grudge of an exceedingly rich dude who wants even more money.