b3log Symphony (aka Sym) 2.2.0 does not properly address XSS in JSON objects, as demonstrated by a crafted userAvatarURL value to /settings/avatar, related to processor/AdminProcessor.java, processor/ArticleProcessor.java, processor/UserProcessor.java, service/ArticleQueryService.java, service/AvatarQueryService.java, and service/CommentQueryService.java.

b3log Symphony (aka Sym) 2.2.0 allows an XSS attack by sending a private letter with a certain /article URI, and a second private letter with a modified title.