An issue was discovered in MISP before 2.4.184. Organisation logo upload is insecure because of a lack of checks for the file extension and MIME type.
https://github.com/MISP/MISP/compare/v2.4.183...v2.4.184
https://github.com/MISP/MISP/commit/312d2d5422235235ddd211dcb6bb5bb09c07791f