includes/editor/insert_image.php in Pivot 1.30 RC2 and earlier creates the authentication credentials from parameters, which allows remote attackers to obtain privileges and upload arbitrary files via modified (1) pass and (2) session parameters, and (3) pass and (4) userlevel indices of the (a) Pivot_Vars[] or (b) Users[] array parameters.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.094
EPSS Ranking 94.8%