CVE Catalog

CVE-2026-79680

MediumCVSS 4.5
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.34%

25th percentile - higher than 25% of all known CVEs

Summary

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.

Risk Assessment

An unauthorized attacker can access the VNC session without knowing the password. This compromises the confidentiality and integrity of the shared application and may lead to session hijacking.

Recommendation

Update Qt VNC Server to a version containing the fix for this vulnerability. Until then, restrict network access to the VNC service and use additional authentication layers such as VPN.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS