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CVE-2026-58394— OPNsense: Stored XSS in Administration Settings via Certificate Description

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 是一款基于 FreeBSD 的防火墙和路由平台。在 26.1.11 版本之前，文件 将证书记录读入数组 ，但在渲染 SSL 证书选择器中的每个证书描述（description）值时，未将该数组传递给 函数进行 HTML 实体转义处理。由于证书描述字段允许输入 HTML 特殊字符，具有 权限的用户可以存储包含恶意标记的内容。当其他用户打开“系统设置 - 管理”页面时，这些标记便会执行。该问题已在 26.1.11 版本中修复。

CVSS 5.2 · Medium

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
opnsense core < 26.1.11 affected
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I. Basic Information for CVE-2026-58394

Vulnerability Information
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Vulnerability Title
OPNsense: Stored XSS in Administration Settings via Certificate Description
Source: CVE Program / CVE List V5
Vulnerability Description
OPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.11, src/www/system_advanced_admin.php reads certificate records into $a_cert but omits that array from legacy_html_escape_form_data() before rendering each certificate descr value in the SSL Certificate selector. The certificate description accepts HTML metacharacters, allowing a user with the page-system-certmanager privilege to store markup that executes when another user opens System Settings Administration. This issue is fixed in version 26.1.11.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
opnsense core < 26.1.11 -

II. Public POCs for CVE-2026-58394

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III. Intelligence Information for CVE-2026-58394

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Patches & Fixes for CVE-2026-58394 (2)

Vendor Advisories for CVE-2026-58394 (1)

Security Blog Posts for CVE-2026-58394 (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-2026-58393 5.9 MEDIUM OPNsense: OpenVPN Client Specific Override common_name allows path traversal in generated
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-2026-58395 4.3 MEDIUM OPNsense: XPath injection in MVC safe-delete

IV. Related Vulnerabilities

Same product: core
Same vendor: opnsense
Same weakness: CWE-79

V. Comments for CVE-2026-58394

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