JumpServer is an open source bastion host and an operation and maintenance security audit system. Prior to v4.10.16-lts, JumpServer improperly validates certificates in the Custom SMS API Client. When JumpServer sends MFA/OTP codes via Custom SMS API, an attacker can intercept the request and capture the verification code BEFORE it reaches the users phone. This vulnerability is fixed in v4.10.16-lts.
Weakness
The product does not validate, or incorrectly validates, a certificate.