CSRF in Opnsense Core
CVE-2026-30868
OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.4, multiple OPNsense MVC API endpoints perform state‑changing operations but are accessible via HTTP GET requests without CSRF protection. The framework CSRF validation in ApiControllerBase only applies to POST/PUT/DELETE methods, allowing authenticated GET requests to bypass CSRF verification. As a result, a malicious website can trigger privileged backend actions when visited by an authenticated user, causing unintended service reloads and configuration changes through configd. This results in an authenticated Cross‑Site Request Forgery vulnerability allowing unauthorized system state changes. This vulnerability is fixed in 26.1.4.
Vulnerability class: CSRF (Cross-Site Request Forgery)
EPSS: 0.001 (3.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:L.
Affected products
- Opnsense Core — versions < 26.1.4
- Opnsense
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-30868?
- CVE-2026-30868 is a medium-severity vulnerability in Opnsense Core, classified under Cross-Site Request Forgery (CSRF). CVSS score: 6.3/10. Published 2026-03-11.
- How severe is CVE-2026-30868?
- Medium severity. CVSS v3 base score is 6.3 out of 10.