CVE-2024-8536 presents a serious security risk in the Ultimate Blocks plugin, used by over 70,000 WordPress sites to enhance post content with custom blocks. This vulnerability allows attackers, specifically users with contributor-level access, to inject malicious JavaScript (JS) into a new post using the plugin’s “Expand” block feature. If exploited, this can lead to admin account creation and full site takeover, putting the entire WordPress installation at risk.
CVE-2024-8536 – Ultimate Blocks – Stored XSS to Admin Account Creation – POC
