CVSS base score
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
What the vulnerability does
The Theme Editor plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 3.1. This is due to missing nonce validation on the ms_update AJAX action. This makes it possible for unauthenticated attackers to modify child theme CSS styles via a forged request granted they can trick an administrator into performing an action such as clicking on a link.
Explanation of Vulnerability in Simple Terms
Theme Editor versions 3.1 and earlier are vulnerable to cross-site request forgery (CSRF) attacks. An attacker can craft a malicious webpage that, when visited by a logged-in site administrator, performs unwanted actions within the theme editor without the admin's knowledge or consent. The attacker cannot read sensitive data, but can modify theme files or settings.
What an attacker can do
Trick a logged-in admin into modifying theme files or settings via a malicious webpage.
Potential impact on your site
An attacker can alter your site's theme code or configuration if an admin visits a malicious link while logged in.
Conditions required to exploit
Admin must be logged in and visit an attacker-controlled webpage; no special privileges required.
Key dates
External resources
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