The The WP Ultimate Review plugin for WordPress is vulnerable to arbitrary shortcode execution in all versions up to, and including, 2.4.3. This is due to the software allowing users to execute an action that does not properly validate a value before running do_shortcode. This makes it possible for authenticated attackers, with subscriber-level access and above, to execute arbitrary shortcodes.
The bypass relies on WordPress's own strip_shortcodes() function unwrapping the [[tag]] double-bracket escape to a bare [tag] that survives wp_insert_post storage and fires when the publicly queryable xs_review post type is rendered through the_content.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
References 6
https://plugins.trac.wordpress.org/browser/wp-ultimate-review/tags/2.4.3/app/co…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/wp-ultimate-review/tags/2.4.3/app/co…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/wp-ultimate-review/tags/2.4.3/app/co…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/wp-ultimate-review/tags/2.4.3/init.p…
security@wordfence.com
https://plugins.trac.wordpress.org/changeset?reponame=&old=3720426%40wp-ultimat…
security@wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/76986a3a-67f8-4d91-9f…
security@wordfence.com