{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-4638","assignerOrgId":"551230f0-3615-47bd-b7cc-93e92e730bbf","state":"PUBLISHED","assignerShortName":"SEC-VLab","dateReserved":"2026-03-23T10:32:11.997Z","datePublished":"2026-09-24T10:57:54.203Z","dateUpdated":"2026-09-24T12:14:20.861Z"},"containers":{"cna":{"providerMetadata":{"orgId":"551230f0-3615-47bd-b7cc-93e92e730bbf","shortName":"SEC-VLab","dateUpdated":"2026-09-24T10:57:54.203Z"},"title":"Plaintext Password Disclosure via VBScript Sensor Error Message in Paessler PRTG Network Monitor","problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-209","description":"CWE-209 Generation of error message containing sensitive information","type":"CWE"}]}],"impacts":[{"capecId":"CAPEC-54","descriptions":[{"lang":"en","value":"CAPEC-54 Query System for Information"}]}],"affected":[{"vendor":"Paessler GmbH","product":"PRTG Network Monitor","versions":[{"status":"affected","version":"0","lessThan":"26.2.120.1449","versionType":"custom"}],"defaultStatus":"unaffected"}],"descriptions":[{"lang":"en","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. \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.","supportingMedia":[{"type":"text/html","base64":false,"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>"}]}],"references":[{"url":"https://r.sec-consult.com/paessler","tags":["third-party-advisory"]},{"url":"https://paessler.freshdesk.com/en/support/solutions/articles/76000088640","tags":["vendor-advisory"]},{"url":"https://www.paessler.com/de/download/","tags":["patch"]},{"url":"https://www.paessler.com/prtg/prtg-network-monitor","tags":["product"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"HIGH","baseScore":7.1,"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"}}],"solutions":[{"lang":"en","value":"Upgrade to Paessler PRTG Network Monitor version 26.2.120.1449 or later.","supportingMedia":[{"type":"text/html","base64":false,"value":"Upgrade to Paessler PRTG Network Monitor version 26.2.120.1449 or later."}]}],"credits":[{"lang":"en","value":"J. Kruchem, SEC Consult Vulnerability Lab","type":"finder"},{"lang":"en","value":"S. Michlits, SEC Consult Vulnerability Lab","type":"finder"}],"source":{"discovery":"EXTERNAL"},"x_generator":{"engine":"Vulnogram 1.0.5"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-24T12:13:17.297572Z","id":"CVE-2026-4638","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-24T12:14:20.861Z"}}]}}