CVE-2026-58390 (GCVE-0-2026-58390)

Vulnerability from cvelistv5 – Published: 2026-10-15 15:21 – Updated: 2026-10-15 15:21
VLAI
Title
OPNsense: Stored XSS to root RCE via OpenVPN client common_name in status views
Summary
OPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.11, the OpenVPN connection-status dashboard widget in src/opnsense/www/js/widgets/OpenVPNClients.js and the connection-status view place a client common_name into data-common-name attributes without quote-safe encoding. Exploitation requires an OpenVPN server configured with username-as-common-name and RADIUS or LDAP authentication, plus the ability to provision or self-register a valid backend username containing a double quote; deployments where the same administrator controls both the identity backend and firewall do not cross a separate trust boundary. An authenticated client using that username can close the attribute and add an event handler, while the local user database is not affected because its username validator rejects quotes. Script executes in an administrator's session when the administrator opens the dashboard or connection-status page and the injected event is triggered; the demonstrated payload used pointer movement over the client row rather than unconditional page-load execution. The advisory demonstrates that the script can read config.xml, invoke privileged APIs, reset the root password, and obtain root command execution. This issue is fixed in version 26.1.11.
Severity
8 (High)
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7771 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
opnsense core Affected: < 26.1.11
guessed Create a notification for this product.
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          "vendor": "opnsense",
          "versions": [
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          "value": "OPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.11, the OpenVPN connection-status dashboard widget in src/opnsense/www/js/widgets/OpenVPNClients.js and the connection-status view place a client common_name into data-common-name attributes without quote-safe encoding. Exploitation requires an OpenVPN server configured with username-as-common-name and RADIUS or LDAP authentication, plus the ability to provision or self-register a valid backend username containing a double quote; deployments where the same administrator controls both the identity backend and firewall do not cross a separate trust boundary. An authenticated client using that username can close the attribute and add an event handler, while the local user database is not affected because its username validator rejects quotes. Script executes in an administrator\u0027s session when the administrator opens the dashboard or connection-status page and the injected event is triggered; the demonstrated payload used pointer movement over the client row rather than unconditional page-load execution. The advisory demonstrates that the script can read config.xml, invoke privileged APIs, reset the root password, and obtain root command execution. This issue is fixed in version 26.1.11."
        }
      ],
      "metrics": [
        {
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      "problemTypes": [
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              "cweId": "CWE-79",
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              "type": "CWE"
            }
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-15T15:21:09.883Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
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          "name": "https://github.com/opnsense/core/security/advisories/GHSA-26cj-h9rj-g5pf",
          "tags": [
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          "url": "https://github.com/opnsense/core/security/advisories/GHSA-26cj-h9rj-g5pf"
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          "name": "https://github.com/opnsense/core/commit/11180daf579879d84d91a7fbea7a59320bc80868",
          "tags": [
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          "url": "https://github.com/opnsense/core/commit/11180daf579879d84d91a7fbea7a59320bc80868"
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          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/opnsense/core/commit/e7b2ac8093f804bef8eb88dfa9a0d99fad00c12b"
        }
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      "source": {
        "advisory": "GHSA-26cj-h9rj-g5pf",
        "discovery": "UNKNOWN"
      },
      "title": "OPNsense: Stored XSS to root RCE via OpenVPN client common_name in status views"
    }
  },
  "cveMetadata": {
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    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-58390",
    "datePublished": "2026-10-15T15:21:09.883Z",
    "dateReserved": "2026-06-30T18:19:58.377Z",
    "dateUpdated": "2026-10-15T15:21:09.883Z",
    "state": "PUBLISHED"
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      "date": "2026-10-16",
      "epss": "0.00476",
      "percentile": "0.39719"
    },
    "nvd": {
      "cve": {
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                "product": "core",
                "vendor": "opnsense",
                "versions": [
                  {
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                    "version": "\u003c 26.1.11"
                  }
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            "source": "security-advisories@github.com"
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        "cveTags": [],
        "descriptions": [
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          }
        ],
        "id": "CVE-2026-58390",
        "lastModified": "2026-10-15T21:08:49.703",
        "metrics": {
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                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H",
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              "impactScore": 6.0,
              "source": "security-advisories@github.com",
              "type": "Secondary"
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        },
        "published": "2026-10-15T16:18:17.890",
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            "url": "https://github.com/opnsense/core/commit/11180daf579879d84d91a7fbea7a59320bc80868"
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          }
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        "vulnStatus": "Deferred",
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            "source": "security-advisories@github.com",
            "type": "Primary"
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    }
  }
}



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