In tangro Business Workflow before 1.18.1, the documentId of attachment uploads to /api/document/attachments/upload can be manipulated. By doing this, users can add attachments to workitems that do not belong to them.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26171
Reference (s):
- https://blog.to.com/advisory-tangro-bwf-1-17-5-multiple-vulnerabilities/
- https://www.tangro.de/