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Vulnerabilities CVE-2026-4631

CVE-2026-4631

Critical
Open
TLP:CLEAR

Cockpit: cockpit: unauthenticated remote code execution due to ssh command-line argument injection

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Description

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 any credential verification takes place, meaning no login is required to exploit the vulnerability.

Details

CVSS Score
9.8
EPSS Score
15.48%

96.5th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Confidence
90%
Published
Apr 7, 2026
Last Modified
Aug 4, 2026
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