Security advisory for YesWiki

Advisory overview

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.

Related references

• https://github.com/YesWiki/yeswiki/commit/f3b0dd093a7ace47dc29a515faeb02635baceae2
• https://github.com/YesWiki/yeswiki/security/advisories/GHSA-q5j6-79p7-mp94
• https://www.vulncheck.com/advisories/yeswiki-before-4.7.0-read-acl-bypass-via-sql-like-wildcards-in-usernames