In Sprout Forms before 3.9.0, there is a potential Server-Side Template Injection vulnerability when using custom fields in Notification Emails which could lead to the execution of Twig code.
CVSS 3.1HIGH 7.4·Network·Low privileges·No interaction·EPSS 0.01029·Published 2020-05-07·Fixed in 3.9.0, 1.2.7CWE-94