What it is
CVE-2026-4631 is an unauthenticated vulnerability affecting Red Hat Enterprise Linux 10 and 5 other products. Cockpit's remote login feature passes user-supplied hostnames and usernames from the web interface to the...
Vulnerability report
Exploited in the wild
High confidence
Not in CISA KEV
CVE-2026-4631
Red Hat Enterprise Linux 10 Remote Code Execution
Red Hat Enterprise Linux 10 · affected before *
- Severity
- CVSS 9.8 · Critical
- Confidence
- High
- Exploit status
- Exploited in the wild
- EPSS
- 9.2%
- First observed
- —
- Last observed
- —
Decision summary
What security teams need to know first
Direct answers before the deeper technical record.
Is it exploited?
Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is high. Also confirmed by third-party sources.
Who is affected?
Red Hat Enterprise Linux 10 affected before *.
What should we do?
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
Overview
Red Hat Enterprise Linux 10 Remote Code Execution
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.
Vendor
Product
Affected
Status
Red Hat
Unaffected
Red Hat Enterprise Linux 10.0 Extended Update Support
cockpit
Before *
Unaffected
- Published
- 07 Apr 2026
- Exploitation Reported
- 08 Jul 2026
- Attack vector
- Remote
- Complexity
- Low
- Privileges
- None
- User interaction
- None
Tags
linux
nuclei_scanner
CVE References
- CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2026-4631
- RHSA-2026:7381 access.redhat.com · Vendor Advisory https://access.redhat.com/errata/RHSA-2026:7381
- RHSA-2026:7382 access.redhat.com · Vendor Advisory https://access.redhat.com/errata/RHSA-2026:7382
- RHSA-2026:7383 access.redhat.com · Vendor Advisory https://access.redhat.com/errata/RHSA-2026:7383
- RHSA-2026:7384 access.redhat.com · Vendor Advisory https://access.redhat.com/errata/RHSA-2026:7384
- RHBZ#2450246 bugzilla.redhat.com · Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=2450246
- VDB Entry — access.redhat.com access.redhat.com · VDB Entry https://access.redhat.com/security/cve/CVE-2026-4631
- GitHub — cockpit-project/cockpit github.com · CVE Record https://github.com/cockpit-project/cockpit/security/advisories/GHSA-m...
Exploitation evidence
Why Previdian marks this CVE as exploited
Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.
Exploited in the wild
The Shadowserver
A trusted third party reported exploitation.
Proof of concept available
Nuclei Templates
Public scanner or PoC coverage increases practical exploitability.
Known exploited vulnerability sources
Per-source evidence links for KEV attestations are available through the Previdian Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| The Shadowserver First | 2026-07-08 00:00 UTC |
Detection
Operational artifacts and observed signals
Make the evidence actionable in scanner, SOC, and edge-control workflows.
Observed signals
- Request targets
- User-Agents
- Callback hosts
- 0
- 0
- 0
Request targets and User-Agents available in Pro. Callback host details available in Enterprise.
Scanner coverage
Nuclei template detected 01 Jun 2026.
View Nuclei template (opens in new tab)Virtual patch status
No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.
Learn about virtual patches →Scanner Artifacts
Scanner and exploit-framework references linked to this CVE.
| Scanner | Reference | Detected |
|---|---|---|
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-4631.yaml | 01 Jun 2026 |
Risk and context
Severity, weaknesses, and research context
CVSS v3.1
9.8
Critical
Potential damage if exploited. Separate from whether attackers are using it.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
9.2%
Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.
Potential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
Cockpit Web Console < 360 - Remote Code Execution
nuclei · Created Unknown
Timeline
From disclosure to observed exploitation
-
00:00 UTC
Added to Previdian KEV Feed
High-confidence, third-party attested exploitation
-
14:21 UTC
Public PoC available
Public proof-of-concept code published
-
15:34 UTC
Nuclei template available
Scanner coverage available
-
16:30 UTC
CVE published
Vulnerability disclosed publicly
-
08:25 UTC
CVE ID reserved
Identifier reserved by the CNA
Pro API
Automate this intelligence
Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
- Evidence confidence and provenance
- First-party sensor telemetry
- PoC and scanner references
- Affected versions and enrichment
- Automation-ready JSON delivery
GET /api/v2/pro/kevs/CVE-2026-4631
Free JSON includes basic KEV fields{
"cve_id": "CVE-2026-4631",
"confidence": "High",
"cvss_score": 9.8,
"cvss_estimated": false,
"epss_score": 0.09216,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "attempts": 0, "sensors": 0 }
}