{"id":"CVE-2026-79680","aliases":["EUVD-2026-85846","GHSA-wc8f-vjgx-jxrw"],"status":"published","title":"Authentication bypass vulnerability in the password authentication mechanism of the Qt VNC Server module","description":"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.","severity":{"version":"4.0","score":4.5,"vector":"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00342,"percentile":0.27977,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-288"],"published":"2026-09-24T10:56:08Z","modified":"2026-09-24T21:08:22Z","products":[{"vendor":"qt","product":"qt"},{"vendor":"the qt company","product":"qt"}],"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"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-79680"},{"url":"https://github.com/advisories/GHSA-wc8f-vjgx-jxrw"}],"sources":{"cve":[{"id":"CVE-2026-79680","title":"Authentication bypass vulnerability in the password authentication mechanism of the Qt VNC Server module","description":"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.","status":"published","published":"2026-09-24T10:56:08.086Z","modified":"2026-09-24T12:18:38.627Z","cvss":[{"version":"4.0","score":4.5,"vector":"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","level":"medium","assessor":"cna"}],"cwes":["CWE-288"],"updated_at":"2026-11-02T13:50:38.739766Z"}],"euvd":[{"id":"EUVD-2026-85846","description":"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.","status":"published","published":"2026-09-24T10:56:08Z","modified":"2026-09-24T12:18:38Z","cvss":[{"version":"4.0","score":4.5,"vector":"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","level":"medium"}],"updated_at":"2026-11-02T17:27:59.466335Z"}],"ghsa":[{"id":"GHSA-wc8f-vjgx-jxrw","title":"Authentication bypass vulnerability in the password authentication mechanism of the Qt VNC Server...","description":"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.","status":"published","published":"2026-09-24T12:31:23Z","modified":"2026-09-24T12:31:29Z","cvss":[{"version":"4.0","score":4.5,"vector":"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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:D/RE:L/U:X","level":"medium"}],"cwes":["CWE-288"],"updated_at":"2026-11-02T15:12:22.2852Z"}],"nvd":[{"id":"CVE-2026-79680","description":"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.","status":"published","published":"2026-09-24T11:16:47.117Z","modified":"2026-09-24T21:08:22.573Z","cvss":[{"version":"4.0","score":4.5,"vector":"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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:D/RE:L/U:X","level":"medium","assessor":"secondary"}],"cwes":["CWE-288"],"updated_at":"2026-11-02T14:12:51.036099Z"}]}}