{"id":"CVE-2026-58393","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-58393","generatedAt":"2026-10-28T08:11:00.038Z","title":"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…","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.","published":"2026-10-15T16:18:18.000Z","lastModified":"2026-10-15T21:08:50.000Z","status":"Deferred","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":5.9,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L"},"cwe":["CWE-22"],"affected":[],"epss":{"score":0.00433,"percentile":0.3742,"date":"2026-10-27","history":[{"date":"2026-10-16","score":0.00433,"percentile":0.36136}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.43%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-15T16:18:18.000Z","detail":{"score":"5.9","severity":"MEDIUM","publishedAt":"2026-10-15T16:18:18.310Z"},"summary":"New CVE, medium severity (CVSS 5.9)."}],"references":[{"url":"https://github.com/opnsense/core/commit/3af496143a19153c18b2f9458b2510d58aff2b98","source":"security-advisories@github.com"},{"url":"https://github.com/opnsense/core/commit/6101b3e2c90482111f420a47775c14a447441a72","source":"security-advisories@github.com"},{"url":"https://github.com/opnsense/core/security/advisories/GHSA-2m9v-p7r9-gfcw","source":"security-advisories@github.com"},{"url":"https://github.com/opnsense/core/security/advisories/GHSA-2m9v-p7r9-gfcw","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-58393","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}