{"id":"CVE-2026-58393","published":"2026-10-15T16:18:18.310","lastModified":"2026-10-15T21:08:49.703","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.","cvssScore":5.9,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L","cwes":["CWE-22"],"vendors":[],"products":[],"references":[{"url":"https://github.com/opnsense/core/commit/3af496143a19153c18b2f9458b2510d58aff2b98","tags":[]},{"url":"https://github.com/opnsense/core/commit/6101b3e2c90482111f420a47775c14a447441a72","tags":[]},{"url":"https://github.com/opnsense/core/security/advisories/GHSA-2m9v-p7r9-gfcw","tags":[]},{"url":"https://github.com/opnsense/core/security/advisories/GHSA-2m9v-p7r9-gfcw","tags":[]}],"exploitRefs":[{"url":"https://github.com/opnsense/core/commit/3af496143a19153c18b2f9458b2510d58aff2b98","tags":[]},{"url":"https://github.com/opnsense/core/commit/6101b3e2c90482111f420a47775c14a447441a72","tags":[]},{"url":"https://github.com/opnsense/core/security/advisories/GHSA-2m9v-p7r9-gfcw","tags":[]},{"url":"https://github.com/opnsense/core/security/advisories/GHSA-2m9v-p7r9-gfcw","tags":[]}],"hasPoc":true,"ai":null}