tangro Business Workflow before 1.18.1 requests a list of allowed filetypes from the server and restricts uploads to the filetypes contained in this list. However, this restriction is enforced in the browser (client-side) and can be circumvented. This allows an attacker to upload any file as an attachment to a workitem.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26174
Reference (s):
- https://blog.to.com/advisory-tangro-bwf-1-17-5-multiple-vulnerabilities/
- https://www.tangro.de/