The Themify Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'css[fonts]' Parameter in all versions up to, and including, 7.8.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The nonce required to reach the vulnerable endpoint is embedded in plain sight within the front-end page markup for all visitors, reducing the access control to a CSRF token rather than an authentication barrier and making the endpoint fully exploitable by unauthenticated attackers.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No 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)
Vulnerable Products
themifyme:themify builder
References 6
https://plugins.trac.wordpress.org/browser/themify-builder/tags/7.8.1/classes/c…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/themify-builder/tags/7.8.1/classes/c…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/themify-builder/tags/7.8.1/classes/c…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/themify-builder/tags/7.8.1/themify/c…
security@wordfence.com
https://plugins.trac.wordpress.org/changeset?reponame=&old=3710320%40themify-bu…
security@wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/fc021ee6-694a-426b-b3…
security@wordfence.com