{"id":"CVE-2026-58393","title":"OPNsense is a FreeBSD based firewall and routing platform","summary":"OPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.11, the OpenVPN Client Specific Override common_name field accepts path traversal sequences and openvpn_csc_conf_write() concatenates the value into /var/et…","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L","cwe":["CWE-22"],"vendor":"opnsense","product":"core","affected":["core < 26.1.11"],"published":"2026-10-15","updated":"2026-10-15","sourceUpdated":"2026-10-15T17:17:25.537","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-58393","references":[{"url":"https://github.com/opnsense/core/commit/3af496143a19153c18b2f9458b2510d58aff2b98","label":"security-advisories@github.com"},{"url":"https://github.com/opnsense/core/commit/6101b3e2c90482111f420a47775c14a447441a72","label":"security-advisories@github.com"},{"url":"https://github.com/opnsense/core/security/advisories/GHSA-2m9v-p7r9-gfcw","label":"security-advisories@github.com"},{"url":"https://github.com/opnsense/core/security/advisories/GHSA-2m9v-p7r9-gfcw","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-15T16:07:43.427308Z"},"ingestedAt":"2026-10-15T16:13:11.536Z","slug":"CVE-2026-58393","body":"## Overview\n\nOPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.11, the OpenVPN Client Specific Override common_name field accepts path traversal sequences and openvpn_csc_conf_write() concatenates the value into /var/etc/openvpn-csc/<vpnid>/<common_name> without normalization or a basename check. The affected event handlers are client_connect.php and user_pass_verify.php. An authenticated user with Client Specific Override privileges can store the traversal value, and a matching OpenVPN client-connect or authentication event causes a generated CSO file to be written outside the intended directory. The file content is generated OpenVPN configuration rather than arbitrary bytes, and practical exploitation requires the attacker to cause a matching common name or username to be processed. This issue is fixed in version 26.1.11.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":44,"depthScoreParts":{"impact":32.5,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":222618,"id":"CVE-2026-58393","ts":1792085014305,"field":"exploit_available","old":"false","new":"true"}]}