phpBB contains an arbitrary file upload vulnerability that allows authenticated attackers to upload malicious files by exploiting the plupload functionality and phar:// stream wrapper. Attackers can upload a crafted zip file containing serialized PHP objects that execute arbitrary code when deserialized through the imagick parameter in attachment settings.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v4.0