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CVE-2026-58392

5.4 · MEDIUM

OPNsense is a FreeBSD based firewall and routing platform.

Published Oct 15, 2026CWE-79EPSS 0.27%

Overview

CVE-2026-58392 is a medium-severity vulnerability. It was published on October 15, 2026 and has a CVSS 3.1 base score of 5.4 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.4, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

OPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.11, the NTP GPS page stores the operator-supplied initcmd value in base64 form, applies legacy_html_escape_form_data() to the encoded string, and then uses base64_decode() to decode the value directly into the GPS initialization-command textarea in src/www/services_ntpd_gps.php. Because decoding occurs after escaping, stored HTML remains unescaped at the output sink. A user with page-services-ntp-gps privilege can store a value that closes the textarea, and script executes in the session of any user who later opens the GPS page. The script can read CSRF material and perform authenticated actions, including actions available to an administrator. This issue is fixed in version 26.1.11.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/opnsense/core/commit/a92d9514b5436c868f8f97138ebed507f6de423cGitHubgithub.com/opnsense/core/commit/ed04a154dc40967541be1388e9134e451be4199eGitHubgithub.com/opnsense/core/security/advisories/GHSA-h793-67jm-j4m5Refhackerask.com/posts/opnsenseGitHubgithub.com/opnsense/core/security/advisories/GHSA-h793-67jm-j4m5

How CyberStrike helps

Frequently asked questions

What is CVE-2026-58392?

CVE-2026-58392 is a medium-severity vulnerability. It was published on October 15, 2026 and has a CVSS 3.1 base score of 5.4 (MEDIUM).

How severe is CVE-2026-58392?

This vulnerability has a CVSS 3.1 base score of 5.4, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-58392?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-58392?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-58392 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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