CVE-2023-42442: JumpServer is an open source bastion host and a professional operation and maintenance security audit system

This week

HIGH 8.2REMOTEUPGRADE

CVE-2023-42442 is a high-severity flaw (CVSS 8.2) 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 a professional operation and maintenance security audit system. Starting in version 3.0.0 and prior to versions 3.5.5 and 3.6.4, session replays can download without authentication. Session replays stored in S3, OSS, or other cloud storage are not affected. The api `/api/v1/terminal/sessions/` permission control is broken and can be accessed anonymously. SessionViewSet permission classes set to `[RBAC

Why this priority

High severity
EPSS top 1%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	63.0% (top 1%)
CISA exploited list	No
Weakness	CWE-287
Published	2023-09-15
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

2023-09-15 21:15 UTCPublished CVE record published
2026-06-17 06:23 UTCUpdated Record last modified

fit2cloud jumpserver UPGRADE

Affected: >= 3.0.0 and < 3.5.5 · >= 3.6.0 and < 3.6.4

Fixed in: 3.5.5, 3.6.4

Safe to downgrade to: a release before 3.0.0

1. Check installed version

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

2. UPGRADE to 3.5.5 (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.

3. If no update is available yet, DOWNGRADE to a release before 3.0.0 (Debian / Ubuntu)

apt-cache madison jumpserver sudo apt install jumpserver=<VERSION_BEFORE_3.0.0> sudo apt-mark hold jumpserver

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list jumpserver sudo dnf downgrade jumpserver-<VERSION_BEFORE_3.0.0> sudo dnf versionlock add jumpserver

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Nuclei scan template: JumpServer > 3.6.4 - Information Disclosure

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-2023-42442?

jumpserver: upgrade to 3.5.5, 3.6.4. Exact commands for each OS are on this page.

Is CVE-2023-42442 being exploited?

CVE-2023-42442 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-2023-42442 affect?

CVE-2023-42442 affects jumpserver. Severity is high (CVSS 8.2). JumpServer is an open source bastion host and a professional operation and maintenance security audit system. Starting in version 3.0.0 and prior to versions 3.5.5 and 3.6.4, session replays can download without authentication. Session repl

How urgent is CVE-2023-42442?

Priority 63/100. High severity; EPSS top 1%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

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-2026-31798 MEDIUM 5.0 UPGRADE JumpServer is an open source bastion host and an operation and maintenance security audit system

References

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