CVE-2026-31798: FIT2CLOUD Jumpserver

Medium severity, CVSS 5.0. EPSS: 0.1% chance of exploitation in the next 30 days.

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 user's phone. This vulnerability is fixed in v4.10.16-lts.

Affected products

• FIT2CLOUD Jumpserver: before 4.10.16 (fixed in 4.10.16)

Published 2026-03-13. Last modified 2026-06-17.