{"id":"CVE-2026-4638","state":"PUBLISHED","title":"Plaintext Password Disclosure via VBScript Sensor Error Message in Paessler PRTG Network Monitor","description":"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.","publishedAt":"2026-09-24T10:57:54.203Z","updatedAt":"2026-09-24T12:14:20.861Z","severity":{"score":7.1,"label":"High","version":"4.0","vector":"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","source":"SEC-VLab"},"assigner":"SEC-VLab","products":["Paessler GmbH PRTG Network Monitor"],"affected":[{"vendor":"Paessler GmbH","product":"PRTG Network Monitor","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"26.2.120.1449","versionType":"custom"}]}],"references":["https://r.sec-consult.com/paessler","https://paessler.freshdesk.com/en/support/solutions/articles/76000088640","https://www.paessler.com/de/download/","https://www.paessler.com/prtg/prtg-network-monitor"],"weaknesses":["CWE-209"],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/4xxx/CVE-2026-4638.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-4638","state":"PUBLISHED","datePublished":"2026-09-24T10:57:54.203Z","dateUpdated":"2026-09-24T12:14:20.861Z","assignerShortName":"SEC-VLab","assignerOrgId":"551230f0-3615-47bd-b7cc-93e92e730bbf","dateReserved":"2026-03-23T10:32:11.997Z"},"containers":{"cna":{"title":"Plaintext Password Disclosure via VBScript Sensor Error Message in Paessler PRTG Network Monitor","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."}],"affected":[{"vendor":"Paessler GmbH","product":"PRTG Network Monitor","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"26.2.120.1449","versionType":"custom"}]}],"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-209","lang":"en","description":"CWE-209 Generation of error message containing sensitive information","type":"CWE"}]}],"providerMetadata":{"shortName":"SEC-VLab","orgId":"551230f0-3615-47bd-b7cc-93e92e730bbf","dateUpdated":"2026-09-24T10:57:54.203Z"},"impacts":[{"capecId":"CAPEC-54","descriptions":[{"lang":"en","value":"CAPEC-54 Query System for Information"}]}],"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":[{"title":"CISA ADP Vulnrichment","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"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-24T12:14:20.861Z"}}]}}}