{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-79680", "assignerOrgId": "a59d8014-47c4-4630-ab43-e1b13cbe58e3", "state": "PUBLISHED", "assignerShortName": "Qt", "dateReserved": "2026-08-25T11:34:53.548Z", "datePublished": "2026-09-24T10:56:08.086Z", "dateUpdated": "2026-09-24T12:18:38.627Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "a59d8014-47c4-4630-ab43-e1b13cbe58e3", "shortName": "Qt", "dateUpdated": "2026-09-24T10:56:08.086Z"}, "title": "Authentication bypass vulnerability in the password authentication mechanism of the Qt VNC Server module", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-288", "description": "CWE-288 Authentication Bypass Using an Alternate Path or Channel", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-220", "descriptions": [{"lang": "en", "value": "CAPEC-220 Client-Server Protocol Manipulation"}]}], "affected": [{"vendor": "qt", "product": "qt", "modules": ["qtvncserver"], "versions": [{"status": "affected", "version": "6.4.0", "lessThan": "6.8.9", "versionType": "python"}, {"status": "affected", "version": "6.9.0", "lessThan": "6.11.3", "versionType": "python"}], "defaultStatus": "unaffected"}], "cpeApplicability": [{"operator": "OR", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4.0", "versionEndExcluding": "6.8.9"}, {"vulnerable": true, "criteria": "cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9.0", "versionEndExcluding": "6.11.3"}]}]}], "descriptions": [{"lang": "en", "value": "Authentication bypass vulnerability in the password authentication mechanism of the Qt VNC Server module. An attacker using a specially modified VNC client that violates the RFB protocol can bypass Qt VNC Server's password authentication and gain unauthorized remote access to the shared application, compromising the confidentiality and integrity of the session.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Authentication bypass vulnerability in the password authentication mechanism of the Qt VNC Server module. An attacker using a specially modified VNC client that violates the RFB protocol can bypass Qt VNC Server's password authentication and gain unauthorized remote access to the shared application, compromising the confidentiality and integrity of the session.</p>"}]}], "references": [{"url": "https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-79680:", "tags": ["issue-tracking"]}, {"url": "https://codereview.qt-project.org/c/qt/tqtc-qtvncserver/+/759160", "tags": ["patch"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "ACTIVE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "UNREPORTED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "DIFFUSE", "vulnerabilityResponseEffort": "LOW", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "MEDIUM", "baseScore": 4.5, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/V:D/RE:L"}}], "source": {"discovery": "INTERNAL"}, "x_generator": {"engine": "Vulnogram 1.0.5; completed with Claude AI (Opus 5.5) - draft only, requires human validation before submission"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-24T12:17:35.115651Z", "id": "CVE-2026-79680", "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": "2026-09-24T12:18:38.627Z"}}]}}