CVE-2026-31798: JumpServer is an open source bastion host and an operation and maintenance security audit system

Q: How do I fix CVE-2026-31798?

jumpserver: upgrade to 4.10.16. Exact commands for each OS are on this page.

Q: Is CVE-2026-31798 being exploited?

CVE-2026-31798 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-31798 affect?

CVE-2026-31798 affects jumpserver. Severity is medium (CVSS 5.0). 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 Cust

Q: How urgent is CVE-2026-31798?

Priority 18/100. No elevated risk signals yet.

Routine

MEDIUM 5.0UPGRADE

CVE-2026-31798 is a medium-severity flaw (CVSS 5.0) affecting jumpserver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.0 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.1% (top 99%)
CISA exploited list	No
Weakness	CWE-295
Published	2026-03-13
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: fit2cloud

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-13 19:54 UTCPublished CVE record published
2026-06-17 10:34 UTCUpdated Record last modified

fit2cloud jumpserver UPGRADE

Affected: < 4.10.16

Fixed in: 4.10.16

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy jumpserver || rpm -q jumpserver || jumpserver --version

2. UPGRADE to 4.10.16 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade jumpserver

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade jumpserver

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-31798?

jumpserver: upgrade to 4.10.16. Exact commands for each OS are on this page.

Is CVE-2026-31798 being exploited?

CVE-2026-31798 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-31798 affect?

CVE-2026-31798 affects jumpserver. Severity is medium (CVSS 5.0). 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 Cust

How urgent is CVE-2026-31798?

Priority 18/100. No elevated risk signals yet.

Related CVEs

CVE-2025-62712 CRITICAL 9.6 UPGRADE JumpServer is an open source bastion host and an operation and maintenance security audit system
CVE-2025-62795 HIGH 7.1 UPGRADE JumpServer is an open source bastion host and an operation and maintenance security audit system
CVE-2023-48193 CRITICAL 9.8 DOWNGRADE Insecure Permissions vulnerability in JumpServer GPLv3 v.3.8.0 allows a remote attacker to execute arbitrary c
CVE-2026-31864 MEDIUM 6.8 UPGRADE JumpServer is an open source bastion host and an operation and maintenance security audit system
CVE-2025-27095 MEDIUM 4.3 UPGRADE JumpServer is an open source bastion host and an operation and maintenance security audit system

References

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