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CVE-2026-56126 (GCVE-0-2026-56126)

Vulnerability from cvelistv5 – Published: 2026-09-03 14:19 – Updated: 2026-09-03 14:38
VLAI
Title
pfSense Plus < 26.07 / CE < 2.9.0 Stored XSS via status_monitoring.php
Summary
pfSense Plus before 26.07 and CE before 2.9.0 allow authenticated users with the Status: Monitoring privilege to inject arbitrary JavaScript via graph configuration parameters in /status_monitoring.php. Multiple POST parameters including graph-left, graph-right, time-period, resolution, start-date, end-date, start-time, end-time, graph-type, invert, and refresh-interval are concatenated and written to the global pfSense XML configuration without sanitization, then echoed unsanitized into a JavaScript string context on page render. Because the setting is stored in the global configuration, the payload executes in the browser of every user who visits the Status: Monitoring page.
Severity
5.1 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
5.4 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
Impacted products
Vendor Product Version CPE status
Netgate pfSense Plus Affected: 0 , < 26.07 (custom)
guessed Create a notification for this product.
Netgate pfSense CE Affected: 0 , < 2.9.0 (semver)
guessed Create a notification for this product.
Date Public
2026-08-20 00:00
Credits
Alex Williams from Pellera Technologies VulnCheck
Show details on NVD website
To clipboard 

{
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          "defaultStatus": "unaffected",
          "packageURL": "pkg:github/getformwork/formwork",
          "product": "pfSense Plus",
          "repo": "https://github.com/getformwork/formwork",
          "vendor": "Netgate",
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              "status": "affected",
              "version": "0",
              "versionType": "custom"
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          "versions": [
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          "type": "finder",
          "value": "Alex Williams from Pellera Technologies"
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      "descriptions": [
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        }
      ],
      "metrics": [
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            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
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            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 5.1,
            "baseSeverity": "MEDIUM",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "LOW",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "LOW",
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            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
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      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
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              "type": "CWE"
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          "url": "https://docs.netgate.com/downloads/pfSense-SA-26_09.packages.asc"
        },
        {
          "name": "Plus Release Notes",
          "tags": [
            "release-notes"
          ],
          "url": "https://docs.netgate.com/pfsense/en/latest/releases/26-07.html"
        },
        {
          "name": "CE Release Notes",
          "tags": [
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          "url": "https://docs.netgate.com/pfsense/en/latest/releases/2-9-0.html"
        },
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        }
      ],
      "title": "pfSense Plus \u003c 26.07 / CE \u003c 2.9.0 Stored XSS via status_monitoring.php",
      "x_generator": {
        "engine": "vulncheck-endgame"
      }
    }
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  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-56126",
    "datePublished": "2026-09-03T14:19:43.180Z",
    "dateReserved": "2026-06-18T19:15:10.651Z",
    "dateUpdated": "2026-09-03T14:38:06.457Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
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  }
}



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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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