Karim El Ouerghemmi

Low-privileged authenticated users, such as authors, in the WordPress core are able to execute JavaScript and perform a stored XSS attack, which can affect high-privileged users.

The issue concerns a free and open-source content management system written in PHP and paired with a MariaDB database. On a multisite, users with Super Admin role can bypass explicit/additional hardening under certain conditions through object injection.

Name of the Vulnerable Software and Affected Versions: WordPress versions prior to 5.5.2 Description: The issue is related to insufficient access control in certain features of the WordPress content management system. This can be exploited by a remote attacker to impact data integrity. The problem specifically involves mishandling embeds from disabled sites on a multisite network, allowing for spam embeds. Recommendations: For WordPress versions prior to 5.5.2, update to version 5.5.2 or later to resolve the issue. As a temporary workaround, consider restricting access to embeds from disabled sites on a multisite network to minimize the risk of exploitation.

Name of the Vulnerable Software and Affected Versions: WordPress versions prior to 5.5.2 Description: The issue is related to insufficient protection measures for web page structures in the WordPress content management system. This can be exploited by a remote attacker to impact data integrity. The problem allows stored XSS via post slugs. Recommendations: For versions prior to 5.5.2, update to version 5.5.2 or later to resolve the issue. As a temporary workaround, consider restricting access to post slug editing to minimize the risk of exploitation.