Redmine before 4.0.9, 4.1.x before 4.1.3, and 4.2.x before 4.2.1 allows users to circumvent the allowed filename extensions of uploaded attachments.
| Software | From | Fixed in |
|---|---|---|
| redmine / redmine | 4.1.0 | 4.1.3 |
| redmine / redmine | 4.2.0 | 4.2.1 |
| redmine / redmine | - | 4.0.9 |
| debian / debian_linux | 9.0 | 9.0.x |