YesWiki before 4.7.0 contains a read-ACL bypass in AclService::updateRequestWithACL, which interpolates usernames into SQL LIKE patterns without escaping the _ and % wildcards. Self-registered attackers can use usernames such as ___ or %%% that over-match ACL tokens, reading pages and Bazar entries restricted to other users or groups via the public Bazar listing API.
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
None
No data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 3
https://github.com/YesWiki/yeswiki/commit/f3b0dd093a7ace47dc29a515faeb02635bace…
disclosure@vulncheck.com
https://github.com/YesWiki/yeswiki/security/advisories/GHSA-q5j6-79p7-mp94
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/yeswiki-before-4.7.0-read-acl-bypass-via-s…
disclosure@vulncheck.com