RHEL 9 : cockpit (RHSA-2026:21394)

high Nessus Plugin ID 317106

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Synopsis

The remote Red Hat host is missing a security update for cockpit.

Description

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:21394 advisory.

Cockpit enables users to administer GNU/Linux servers using a web browser. It offers network configuration, log inspection, diagnostic reports, SELinux troubleshooting, interactive command-line sessions, and more.

Security Fix(es):

* cockpit: Cockpit: Arbitrary command execution via crafted links in system logs UI (CVE-2026-4802)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the RHEL cockpit package based on the guidance in RHSA-2026:21394.

Plugin Details

Severity: High

ID: 317106

File Name: redhat-RHSA-2026-21394.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Red Hat Local Security Checks

Published: 5/27/2026

Updated: 5/27/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

Vendor

Vendor Severity: Important

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 6.7

Vector: CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C

CVSS Score Source: CVE-2026-4802

CVSS v3

Risk Factor: High

Base Score: 8

Temporal Score: 7

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:redhat:rhel_e4s:9.2, p-cpe:/a:redhat:enterprise_linux:cockpit-doc, p-cpe:/a:redhat:enterprise_linux:cockpit-bridge, p-cpe:/a:redhat:enterprise_linux:cockpit-packagekit, p-cpe:/a:redhat:enterprise_linux:cockpit-pcp, p-cpe:/a:redhat:enterprise_linux:cockpit-storaged, p-cpe:/a:redhat:enterprise_linux:cockpit, p-cpe:/a:redhat:enterprise_linux:cockpit-system, p-cpe:/a:redhat:enterprise_linux:cockpit-ws

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Ease: No known exploits are available

Patch Publication Date: 5/27/2026

Vulnerability Publication Date: 5/11/2026

Reference Information

CVE: CVE-2026-4802

CWE: 78

RHSA: 2026:21394

Detections

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