The Webmention plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 5.6.2 via the 'Tools::read' function. This makes it possible for authenticated attackers, with Subscriber-level access and above, to make web requests to arbitrary locations originating from the web application and can be used to query and modify information from internal services.
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 4
https://github.com/pfefferle/wordpress-webmention/blob/057223cee18a9e93b017d0f2…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/webmention/tags/5.6.2/includes/class…
security@wordfence.com
https://plugins.trac.wordpress.org/changeset/3494831/webmention
security@wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/02c9beba-dfa5-4a30-83…
security@wordfence.com