Critical · published April 19, 2023
CVSS calls it critical at 10.0. It sits in the 99.4th percentile for exploit probability.
Strapi through 4.5.5 allows authenticated Server-Side Template Injection (SSTI) that can be exploited to execute arbitrary code on the server. A remote attacker with access to the Strapi admin panel can inject a crafted payload that executes code on the server into an email template that bypasses the validation checks that should prevent code execution.