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CVE-2026-58393— OPNsense: OpenVPN Client Specific Override common_name allows path traversal in generated CSO files

Quick assessment

Affected
opnsense core
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OPNsense 是一个基于 FreeBSD 的防火墙和路由平台。在 26.1.11 版本之前，OpenVPN 客户端特定覆盖（Client Specific Override）配置中的 common_name 字段会接受路径遍历序列，而函数 openvpn_csc_conf_write() 会未经规范化或未进行 basename 检查，直接将该值拼接到路径 /var/etc/openvpn-csc/<vpnid>/<common_name> 中。受影响的代码位置包括 client_connect.php 和 us

CVSS 5.9 · Medium

Possible ATT&CK Techniques 1 AI

T1564 · Hide Artifacts

Affected Version Matrix 1

VendorProduct Version RangeStatus
opnsense core < 26.1.11 affected
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I. Basic Information for CVE-2026-58393

Vulnerability Information
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Vulnerability Title
OPNsense: OpenVPN Client Specific Override common_name allows path traversal in generated CSO files
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
opnsense core < 26.1.11 -

II. Public POCs for CVE-2026-58393

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III. Intelligence Information for CVE-2026-58393

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Patches & Fixes for CVE-2026-58393 (2)

Vendor Advisories for CVE-2026-58393 (1)

Same Patch Batch · opnsense · 2026-10-15 · 10 CVEs total

CVE-2026-57155 9.9 CRITICAL OPNsense: Root RCE via Arbitrary File Write in GeoIP Alias Importer
CVE-2026-63442 8.1 HIGH OPNsense: Log Forgery via Login Username CRLF in WebGUI Authentication → Pf Table IP Block
CVE-2026-58390 8.0 HIGH OPNsense: Stored XSS to root RCE via OpenVPN client common_name in status views
CVE-2026-53582 7.1 HIGH OPNsense: XPATH Injection can disclose any secret in config.xml
CVE-2026-71490 7.1 HIGH OPNsense: Direct comma-separated user privileges bypass OPNsense MVC read-only write prote
CVE-2026-58391 5.4 MEDIUM OPNsense: Stored XSS in Firewall Rules/NAT pages via a HTML-attribute breakout
CVE-2026-58392 5.4 MEDIUM OPNsense: Stored XSS in Services: NTP GPS
CVE-2026-58394 5.2 MEDIUM OPNsense: Stored XSS in Administration Settings via Certificate Description
CVE-2026-58395 4.3 MEDIUM OPNsense: XPath injection in MVC safe-delete

IV. Related Vulnerabilities

Same product: core
Same vendor: opnsense
Same weakness: CWE-22

V. Comments for CVE-2026-58393

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