{"id":"CVE-2026-58393","revision":"a5a9f0cdbfaf442aa1f86da9f8504cd3","records":[{"revision":"a5a9f0cdbfaf442aa1f86da9f8504cd3","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-58393","aliases":[],"title":"OPNsense: OpenVPN Client Specific Override common_name allows path traversal in generated CSO files","description":"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/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.","state":0,"publishedAt":"2026-10-15T15:15:45.924+00:00","modifiedAt":"2026-10-15T16:07:55.688+00:00","affected":[{"ecosystem":"Vendor product","name":"core","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"opnsense\",\n                    \"product\": \"core\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 26.1.11\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L","score":5.9,"severity":"MEDIUM"}],"references":["https://github.com/opnsense/core/security/advisories/GHSA-2m9v-p7r9-gfcw","https://github.com/opnsense/core/commit/3af496143a19153c18b2f9458b2510d58aff2b98","https://github.com/opnsense/core/commit/6101b3e2c90482111f420a47775c14a447441a72"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-58393","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-58393","identifiers":["CVE-2026-58393"]},"retained":false,"historicalAffected":[]}],"coverage":[]}