CVE-2026-31798

JumpServer Improper Certificate Validation in Custom SMS API Client

State: Published
Severity: 5.0 Medium
Published: Mar 13, 2026
Updated: Mar 13, 2026
Reserved: Mar 9, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	5.0 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L	GitHub_M

Weaknesses

CWE-295 Improper Certificate Validation

Affected Products

Product	Versions
jumpserverjumpserver	< 4.10.16-ltsAffected

References

https://github.com/jumpserver/jumpserver/security/advisories/GHSA-26pj-mmxw-w3w7

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