: Can lead to data theft, where attackers scrape sensitive information from logged-in users.
Do not use the "Update Now" button. The incremental update path from 4.3.1 to 6.x is fraught with PHP version conflicts and database collation errors. wordpress version 4.3.1 exploit
When a user or a search engine crawler visited this feed, the unfiltered script would execute in the context of the website. : Can lead to data theft, where attackers
:This was a high-priority vulnerability where the WordPress core mishandled unclosed HTML elements during the processing of shortcode tags. An attacker could inject malicious scripts or HTML into a page, which would then execute in the browsers of unsuspecting visitors. This could be used to steal session cookies or hijack user accounts. When a user or a search engine crawler
Exploits often leave backdoors in 404.php or functions.php . Compare your theme files against the original version from the developer.
Because the script comes from a trusted source (the website itself), the browser executes it without suspicion, potentially allowing the attacker to steal session cookies, hijack accounts, or deface the site.
If you are reading this because you suspect a site is on 4.3.1, do not panic. Do not simply "patch" the hole. The site is already a zombie.