FKIE_CVE-2026-58392

Vulnerability from fkie_nvd - Published: 2026-10-15 16:18 - Updated: 2026-10-15 21:08
Severity
5.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Summary
OPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.11, the NTP GPS page stores the operator-supplied initcmd value in base64 form, applies legacy_html_escape_form_data() to the encoded string, and then uses base64_decode() to decode the value directly into the GPS initialization-command textarea in src/www/services_ntpd_gps.php. Because decoding occurs after escaping, stored HTML remains unescaped at the output sink. A user with page-services-ntp-gps privilege can store a value that closes the textarea, and script executes in the session of any user who later opens the GPS page. The script can read CSRF material and perform authenticated actions, including actions available to an administrator. This issue is fixed in version 26.1.11.
References
security-advisories@github.comhttps://github.com/opnsense/core/commit/a92d9514b5436c868f8f97138ebed507f6de423c
security-advisories@github.comhttps://github.com/opnsense/core/commit/ed04a154dc40967541be1388e9134e451be4199e
security-advisories@github.comhttps://github.com/opnsense/core/security/advisories/GHSA-h793-67jm-j4m5
security-advisories@github.comhttps://hackerask.com/posts/opnsense
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/opnsense/core/security/advisories/GHSA-h793-67jm-j4m5
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "core",
          "vendor": "opnsense",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 26.1.11"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "OPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.11, the NTP GPS page stores the operator-supplied initcmd value in base64 form, applies legacy_html_escape_form_data() to the encoded string, and then uses base64_decode() to decode the value directly into the GPS initialization-command textarea in src/www/services_ntpd_gps.php. Because decoding occurs after escaping, stored HTML remains unescaped at the output sink. A user with page-services-ntp-gps privilege can store a value that closes the textarea, and script executes in the session of any user who later opens the GPS page. The script can read CSRF material and perform authenticated actions, including actions available to an administrator. This issue is fixed in version 26.1.11."
    }
  ],
  "id": "CVE-2026-58392",
  "lastModified": "2026-10-15T21:08:49.703",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.3,
        "impactScore": 2.7,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-58392",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-15T15:54:50.680359Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-10-15T16:18:18.167",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/opnsense/core/commit/a92d9514b5436c868f8f97138ebed507f6de423c"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/opnsense/core/commit/ed04a154dc40967541be1388e9134e451be4199e"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/opnsense/core/security/advisories/GHSA-h793-67jm-j4m5"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://hackerask.com/posts/opnsense"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/opnsense/core/security/advisories/GHSA-h793-67jm-j4m5"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}



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