The W3 Total Cache plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'comment' parameter in all versions up to, and including, 2.10.7 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. This requires HTML Minify to be enabled with the default 'mfunc' entry present in the ignored-comment stems list, and exploitation depends on the attacker predicting the md5(time()) placeholder namespace by reading the server clock via the HTTP Date response header within the applicable time window.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
High
Difficult 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
boldgrid:w3 total cache
References 6
https://github.com/BoldGrid/w3-total-cache/commit/35c6896332aff6b41888db0595cf0…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/w3-total-cache/tags/2.10.7/Minify_Pl…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/w3-total-cache/tags/2.10.7/lib/Minif…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/w3-total-cache/tags/2.10.7/lib/Minif…
security@wordfence.com
https://plugins.trac.wordpress.org/changeset/3757452/w3-total-cache/trunk/lib/M…
security@wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/3a14a537-64e7-415b-be…
security@wordfence.com