The SEOmatic component before 3.3.0 for Craft CMS allows Server-Side Template Injection that leads to RCE via malformed data to the metacontainers controller.
In some circumstances, Craft 2 before 2.7.10 and 3 before 3.2.6 wasn't stripping EXIF data from user-uploaded images when it was configured to do so, potentially exposing personal/geolocation data to the public.