OPNsense os-acme-client Plugin up to 4.17.0 Google Cloud DNS Validation DnsGcloud::prepare os command injection

Summaryinfo

A vulnerability has been found in OPNsense os-acme-client Plugin up to 4.17.0 and classified as very critical. Affected by this issue is the function DnsGcloud::prepare of the component Google Cloud DNS Validation Module. The manipulation leads to os command injection. This vulnerability is traded as CVE-2026-123025. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in OPNsense os-acme-client Plugin up to 4.17.0. This issue affects the function DnsGcloud::prepare of the component Google Cloud DNS Validation Module. The manipulation with an unknown input leads to a os command injection vulnerability. Using CWE to declare the problem leads to CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

An OS Command Injection vulnerability was discovered in the Google Cloud DNS validation module of the OPNsense os-acme-client plugin through 4.17. The DnsGcloud::prepare() method decodes the dns_gcloud_key model field and directly interpolates the string fields gcloud_account and gcloud_project into a shell command passed to proc_open() via LeUtils::run_shell_command() without any validation or escaping. A remote authenticated user with privileges to issue or renew certificates through the WebGUI/API can achieve arbitrary code execution as root.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-123025 since 11/05/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/05/2026). The attack technique deployed by this issue is T1202 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• OPNsense

Name

• os-acme-client Plugin

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4
• 4.5
• 4.6
• 4.7
• 4.8
• 4.9
• 4.10
• 4.11
• 4.12
• 4.13
• 4.14
• 4.15
• 4.16
• 4.17.0

CPE 2.3info

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CPE 2.2info

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