Improper Link Resolution Before File Access ('Link Following')
The package github.com/kataras/iris versions prior to 12.2.0-alpha8 are vulnerable to unsafe handling of file names during upload using "UploadFormFiles" method. This vulnerability allows attackers to write to arbitrary locations outside the designated target folder.
CWE-59 - Improper Link Resolution Before File Access
'Improper link resolution before file access' occurs when software accesses a file resource but fails to verify that the file isn't a link or shortcut to another file. An attacker can potentially gain access to arbitrary files and from there the impact can vary, depending on the application, from sensitive data exposure to remote code execution.