CVE-2026-4631: Cockpit's remote login feature passes user-supplied hostnames and usernames from the web interface to the SSH

Q: How do I fix CVE-2026-4631?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Q: Is CVE-2026-4631 being exploited?

CVE-2026-4631 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-2026-4631 affect?

CVE-2026-4631 affects affected software. Severity is critical (CVSS 9.8). Cockpit's remote login feature passes user-supplied hostnames and usernames from the web interface to the SSH client without validation or sanitization. An attacker with network access to the Cockpit web service can craft a single HTTP requ

Q: How urgent is CVE-2026-4631?

Priority 68/100. Critical severity; EPSS top 3%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTE

CVE-2026-4631 is a critical-severity flaw (CVSS 9.8) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cockpit's remote login feature passes user-supplied hostnames and usernames from the web interface to the SSH client without validation or sanitization. An attacker with network access to the Cockpit web service can craft a single HTTP request to the login endpoint that injects malicious SSH options or shell commands, achieving code execution on the Cockpit host without valid credentials. The injection occurs during the authentication flow before

Why this priority

Critical severity
EPSS top 3%: 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	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	15.5% (top 3%)
CISA exploited list	No
Weakness	CWE-78
Published	2026-04-07
Last modified	2026-10-26

Publisher (CNA): Red Hat, Inc.

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Timeline

2026-04-07 17:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

Exact fixes by distribution

Debian 12 · cockpit · NOT AFFECTED

Debian 13 · cockpit · FIXED · 337-1+deb13u1

sudo apt update && sudo apt install --only-upgrade cockpit dpkg --compare-versions "$(dpkg-query -W -f='${Version}' cockpit)" ge "337-1+deb13u1" && echo PATCHED || echo STILL-VULNERABLE

RHEL 10 · cockpit · FIXED · cockpit-344-3.el10_1

sudo dnf upgrade --advisory=RHSA-2026:7383 rpm -q cockpit

RHEL 10.0 Extended Update Support · cockpit · FIXED · cockpit-334.1-3.el10_0

sudo dnf upgrade --advisory=RHSA-2026:7381 rpm -q cockpit

RHEL 9 · cockpit · FIXED · cockpit-356.1-1.el9_8

sudo dnf upgrade --advisory=RHBA-2026:21387 rpm -q cockpit

RHEL 9.6 Extended Update Support · cockpit · FIXED · cockpit-334.2-2.el9_6

sudo dnf upgrade --advisory=RHSA-2026:7382 rpm -q cockpit

RHEL 7 · cockpit · NOT AFFECTED

Public exploits and detection

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

GitHub PoC: cyberheartmi9/CVE-2026-4631-cockpit-RCE (15 stars)
GitHub PoC: ExDev994/CVE-2026-4631-cockpit-RCE (0 stars)
Exploit-DB: Cockpit 359 - RCE
Nuclei scan template: Cockpit Web Console < 360 - Remote Code Execution

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-2026-4631?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Is CVE-2026-4631 being exploited?

CVE-2026-4631 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-2026-4631 affect?

CVE-2026-4631 affects affected software. Severity is critical (CVSS 9.8). Cockpit's remote login feature passes user-supplied hostnames and usernames from the web interface to the SSH client without validation or sanitization. An attacker with network access to the Cockpit web service can craft a single HTTP requ

How urgent is CVE-2026-4631?

Priority 68/100. Critical severity; EPSS top 3%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

References

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