CVE-2026-4638

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

• https://paessler.freshdesk.com/en/support/solutions/articles/76000088640 551230f0-3615-47bd-b7cc-93e92e730bbf
• https://r.sec-consult.com/paessler 551230f0-3615-47bd-b7cc-93e92e730bbf
• https://www.paessler.com/de/download/ 551230f0-3615-47bd-b7cc-93e92e730bbf
• https://www.paessler.com/prtg/prtg-network-monitor 551230f0-3615-47bd-b7cc-93e92e730bbf

The full cvelistV5 record. Download as CVE-2026-4638.json.

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  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-4638",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-24T12:13:17.297572Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-24T12:14:20.861Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "PRTG Network Monitor",
          "vendor": "Paessler GmbH",
          "versions": [
            {
              "lessThan": "26.2.120.1449",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "J. Kruchem, SEC Consult Vulnerability Lab"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "S. Michlits, SEC Consult Vulnerability Lab"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "<div><span>PRTG Network Monitor before version 26.2.120.1449 ships a demo EXE/Script sensor that multiplies two integer parameters using cscript.exe. If a non-numeric value is passed instead, cscript.exe raises a 'Type mismatch' runtime error that includes the offending parameter value in plaintext. PRTG provides a documented placeholder variable, %windowspassword, which resolves to the configured Windows/domain password used by PRTG and can be passed as a sensor parameter.&nbsp;</span></div><div><span><br></span></div><div><span>Any PRTG user who is not restricted to read-only access and is permitted to create sensors (the default for non-read-only users) can pass %windowspassword as an argument to the demo VBScript sensor, triggering the type-mismatch error and causing PRTG to display the plaintext password in the sensor's error output.</span></div>"
            }
          ],
          "value": "PRTG Network Monitor before version 26.2.120.1449 ships a demo EXE/Script sensor that multiplies two integer parameters using cscript.exe. If a non-numeric value is passed instead, cscript.exe raises a 'Type mismatch' runtime error that includes the offending parameter value in plaintext. PRTG provides a documented placeholder variable, %windowspassword, which resolves to the configured Windows/domain password used by PRTG and can be passed as a sensor parameter.\u00a0\n\n\n\n\nAny PRTG user who is not restricted to read-only access and is permitted to create sensors (the default for non-read-only users) can pass %windowspassword as an argument to the demo VBScript sensor, triggering the type-mismatch error and causing PRTG to display the plaintext password in the sensor's error output."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-54",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-54 Query System for Information"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "LOW",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-209",
              "description": "CWE-209 Generation of error message containing sensitive information",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-24T10:57:54.203Z",
        "orgId": "551230f0-3615-47bd-b7cc-93e92e730bbf",
        "shortName": "SEC-VLab"
      },
      "references": [
        {
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://r.sec-consult.com/paessler"
        },
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://paessler.freshdesk.com/en/support/solutions/articles/76000088640"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://www.paessler.com/de/download/"
        },
        {
          "tags": [
            "product"
          ],
          "url": "https://www.paessler.com/prtg/prtg-network-monitor"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Upgrade to Paessler PRTG Network Monitor version 26.2.120.1449 or later."
            }
          ],
          "value": "Upgrade to Paessler PRTG Network Monitor version 26.2.120.1449 or later."
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Plaintext Password Disclosure via VBScript Sensor Error Message in Paessler PRTG Network Monitor",
      "x_generator": {
        "engine": "Vulnogram 1.0.5"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "551230f0-3615-47bd-b7cc-93e92e730bbf",
    "assignerShortName": "SEC-VLab",
    "cveId": "CVE-2026-4638",
    "datePublished": "2026-09-24T10:57:54.203Z",
    "dateReserved": "2026-03-23T10:32:11.997Z",
    "dateUpdated": "2026-09-24T12:14:20.861Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}