Phproject before 1.8.7 contains a missing object-level authorization vulnerability in the REST API issue endpoints (singleget, singlecomments, singlecommentspost) that allows authenticated API key holders to bypass the security.restrictaccess confidentiality control by never invoking the allowAccess() authorization routine. Attackers can use a valid API key to read restricted issue contents and comments, including owner and author email addresses, and post unauthorized comments to issues they should not have access to.