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CVE-2026-4631 (GCVE-0-2026-4631)
Vulnerability from cvelistv5 – Published: 2026-04-07 16:30 – Updated: 2026-04-10 21:05- CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
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| Red Hat | Red Hat Enterprise Linux 10 |
Unaffected:
0:344-3.el10_1 , < *
(rpm)
cpe:/o:redhat:enterprise_linux:10.1 |
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FKIE_CVE-2026-4631
Vulnerability from fkie_nvd - Published: 2026-04-07 17:16 - Updated: 2026-04-08 21:27| Vendor | Product | Version |
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GHSA-RQ49-H582-83M7
Vulnerability from github – Published: 2026-04-07 18:31 – Updated: 2026-04-07 18:31Cockpit'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.
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RHSA-2026:7384
Vulnerability from csaf_redhat - Published: 2026-04-10 15:07 - Updated: 2026-04-10 21:19Cockpit'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.
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"text": "An update for cockpit is now available for Red Hat Enterprise Linux 9.\n\nRed Hat Product Security has rated this update as having a security impact of\nCritical. A Common Vulnerability Scoring System (CVSS) base score, which gives a\ndetailed severity rating, is available for each vulnerability from the CVE\nlink(s) in the References section.",
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"text": "Cockpit enables users to administer GNU/Linux servers using a web browser. It\noffers network configuration, log inspection, diagnostic reports, SELinux\ntroubleshooting, interactive command-line sessions, and more.\n\nSecurity Fix(es):\n\n* cockpit: ws: be more explicit when handling hostnames on cli (CVE-2026-4631)\n\nFor more details about the security issue(s), including the impact, a CVSS\nscore, acknowledgments, and other related information, refer to the CVE page(s)\nlisted in the References section.",
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"text": "Cockpit\u0027s 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.",
"title": "Vulnerability description"
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"text": "cockpit: Cockpit: Unauthenticated remote code execution due to SSH command-line argument injection",
"title": "Vulnerability summary"
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"title": "Statement"
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"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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RHSA-2026:7381
Vulnerability from csaf_redhat - Published: 2026-04-10 14:23 - Updated: 2026-04-10 21:19Cockpit'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.
| URL | Category | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||
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"name": "Improper Neutralization of Special Elements used in an OS Command (\u0027OS Command Injection\u0027)"
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"text": "Cockpit\u0027s 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.",
"title": "Vulnerability description"
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"text": "cockpit: Cockpit: Unauthenticated remote code execution due to SSH command-line argument injection",
"title": "Vulnerability summary"
},
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"text": "Two configuration factors determine whether a Cockpit installation is vulnerable to remote code execution.\n\nFirst, the hostname injection attack (injecting SSH options like -oProxyCommand via the URL path) is blocked by OpenSSH 9.6 and later, which validates hostnames and rejects shell metacharacters before establishing a connection. Systems running Cockpit 327 or later with an OpenSSH version older than 9.6 are vulnerable to unauthenticated remote code execution in the default configuration. Systems with OpenSSH 9.6 or later are not vulnerable to this attack path.\n\nSecond, the username injection attack (injecting shell commands via the SSH username) requires that the system\u0027s SSH configuration uses the %r (remote username) token within a Match exec directive. This is not part of any default OpenSSH configuration. Systems that do not use %r in a Match exec directive are not vulnerable to this attack path, regardless of OpenSSH version.\n\nBoth attack paths require network access to the Cockpit web service (port 9090 by default) and that remote host login is enabled, which is the default Cockpit configuration.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
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"url": "https://access.redhat.com/security/cve/CVE-2026-4631"
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450246"
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-4631"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-4631",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4631"
}
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"release_date": "2026-04-07T15:52:00+00:00",
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"category": "vendor_fix",
"date": "2026-04-10T14:23:39+00:00",
"details": "Before applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258",
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RHSA-2026:7382
Vulnerability from csaf_redhat - Published: 2026-04-10 15:11 - Updated: 2026-04-10 21:19Cockpit'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.
| URL | Category | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||
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"name": "Improper Neutralization of Special Elements used in an OS Command (\u0027OS Command Injection\u0027)"
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"text": "Cockpit\u0027s 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.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "cockpit: Cockpit: Unauthenticated remote code execution due to SSH command-line argument injection",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Two configuration factors determine whether a Cockpit installation is vulnerable to remote code execution.\n\nFirst, the hostname injection attack (injecting SSH options like -oProxyCommand via the URL path) is blocked by OpenSSH 9.6 and later, which validates hostnames and rejects shell metacharacters before establishing a connection. Systems running Cockpit 327 or later with an OpenSSH version older than 9.6 are vulnerable to unauthenticated remote code execution in the default configuration. Systems with OpenSSH 9.6 or later are not vulnerable to this attack path.\n\nSecond, the username injection attack (injecting shell commands via the SSH username) requires that the system\u0027s SSH configuration uses the %r (remote username) token within a Match exec directive. This is not part of any default OpenSSH configuration. Systems that do not use %r in a Match exec directive are not vulnerable to this attack path, regardless of OpenSSH version.\n\nBoth attack paths require network access to the Cockpit web service (port 9090 by default) and that remote host login is enabled, which is the default Cockpit configuration.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"details": "Before applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258",
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RHSA-2026:7383
Vulnerability from csaf_redhat - Published: 2026-04-10 14:30 - Updated: 2026-04-10 21:19Cockpit'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.
| URL | Category | ||||||||||||||||||||||
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|
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{
"names": [
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"name": "Improper Neutralization of Special Elements used in an OS Command (\u0027OS Command Injection\u0027)"
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"category": "description",
"text": "Cockpit\u0027s 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.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "cockpit: Cockpit: Unauthenticated remote code execution due to SSH command-line argument injection",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Two configuration factors determine whether a Cockpit installation is vulnerable to remote code execution.\n\nFirst, the hostname injection attack (injecting SSH options like -oProxyCommand via the URL path) is blocked by OpenSSH 9.6 and later, which validates hostnames and rejects shell metacharacters before establishing a connection. Systems running Cockpit 327 or later with an OpenSSH version older than 9.6 are vulnerable to unauthenticated remote code execution in the default configuration. Systems with OpenSSH 9.6 or later are not vulnerable to this attack path.\n\nSecond, the username injection attack (injecting shell commands via the SSH username) requires that the system\u0027s SSH configuration uses the %r (remote username) token within a Match exec directive. This is not part of any default OpenSSH configuration. Systems that do not use %r in a Match exec directive are not vulnerable to this attack path, regardless of OpenSSH version.\n\nBoth attack paths require network access to the Cockpit web service (port 9090 by default) and that remote host login is enabled, which is the default Cockpit configuration.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-4631"
},
{
"category": "external",
"summary": "RHBZ#2450246",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450246"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-4631",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-4631"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-4631",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4631"
}
],
"release_date": "2026-04-07T15:52:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-04-10T14:30:44+00:00",
"details": "Before applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
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"threats": [
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"category": "impact",
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}
],
"title": "cockpit: Cockpit: Unauthenticated remote code execution due to SSH command-line argument injection"
}
]
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.