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CVE-2026-79680

Authentication bypass vulnerability in the password authentication mechanism of the Qt VNC Server module

Medium4.5EPSS 0.34%
Published
Updated
Reserved
Assigned by
Qt

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.

Scores

CVSS scores of CVE-2026-79680, by who scored it
Scored byCVSSScoreVector
QtCNA (assigner)4.0Medium4.5CVSS: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
NVDNVD · Awaiting Analysis4.0Medium4.5CVSS: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
EPSS (exploitation in 30 days)
0.34% · top 72% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.5.

Weakness

Affected products

  • qt · qt

    • affected 6.4.0 – < 6.8.9
    • affected 6.9.0 – < 6.11.3

References (2)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .