CVE-2026-79680— Authentication bypass vulnerability in the password authentication mechanism of the Qt VNC Server module
Quick assessment
Affected
qt qt
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Qt VNC 服务器模块的密码认证机制中存在身份验证绕过漏洞。攻击者可以通过使用一个经过特殊修改、违反 RFB 协议的 VNC 客户端，绕过 Qt VNC 服务器的密码认证，从而获得对共享应用的未授权远程访问权限，导致会话的机密性和完整性受到损害。
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I. Basic Information for CVE-2026-79680
Vulnerability Information
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Vulnerability Title
Authentication bypass vulnerability in the password authentication mechanism of the Qt VNC Server module
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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: CVE Program / CVE List V5
Vulnerability Type
使用候选路径或通道进行的认证绕过
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-79680
| # | POC Description | Source Link | Shenlong Link |
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Other References for CVE-2026-79680 (2)
IV. Related Vulnerabilities
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V. Comments for CVE-2026-79680
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