What is CVE-2026-31798?

CVE-2026-31798 is a medium-severity vulnerability in Fit2cloud Jumpserver, classified under Improper Certificate Validation. CVSS score: 5.0/10. Published 2026-03-13.

How severe is CVE-2026-31798?

Medium severity. CVSS v3 base score is 5.0 out of 10.

Vulnerability in Fit2cloud Jumpserver

CVE-2026-31798

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 Cus…

Vulnerability class: Improper Certificate Validation

EPSS: 0.001 (0.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L.

Affected products

Fit2cloud Jumpserver
Jumpserver — versions < 4.10.16-lts

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-31798?: CVE-2026-31798 is a medium-severity vulnerability in Fit2cloud Jumpserver, classified under Improper Certificate Validation. CVSS score: 5.0/10. Published 2026-03-13.
How severe is CVE-2026-31798?: Medium severity. CVSS v3 base score is 5.0 out of 10.