Vulnerability Details CVE-2026-7839
UltraVNC repeater through 1.8.2.2 initializes the HTTP administration server with a hardcoded default password. In repeater/webgui/settings.c:197, when settings2.txt is absent on first run the repeater writes the literal string "adminadmi2" as the admin password via strcpy_s(saved_password, 64, "adminadmi2"). The HTTP Basic-auth handler wi_decode_auth() checks this password without rate-limiting or lockout. Any remote attacker who can reach the repeater HTTP port (default TCP 80) can authenticate as administrator using the well-known default credential on a fresh or unmodified installation, gaining full control of the repeater configuration including allow/deny rules and session visibility.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 24.5%
CVSS Severity
CVSS v3 Score 9.1
Products affected by CVE-2026-7839
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cpe:2.3:a:uvnc:ultravnc:1.0.9.6.2
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cpe:2.3:a:uvnc:ultravnc:1.1.8.9
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cpe:2.3:a:uvnc:ultravnc:1.1.9.3
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cpe:2.3:a:uvnc:ultravnc:1.1.9.6
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cpe:2.3:a:uvnc:ultravnc:1.2.0.5
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cpe:2.3:a:uvnc:ultravnc:1.2.0.9
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cpe:2.3:a:uvnc:ultravnc:1.2.1.0
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cpe:2.3:a:uvnc:ultravnc:1.2.1.2
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cpe:2.3:a:uvnc:ultravnc:1.2.1.6
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cpe:2.3:a:uvnc:ultravnc:1.2.1.7
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cpe:2.3:a:uvnc:ultravnc:1.2.2.2
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cpe:2.3:a:uvnc:ultravnc:1.2.2.3
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cpe:2.3:a:uvnc:ultravnc:1.2.2.4
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cpe:2.3:a:uvnc:ultravnc:1.2.4.0
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cpe:2.3:a:uvnc:ultravnc:1.3.2
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cpe:2.3:a:uvnc:ultravnc:1.3.4
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cpe:2.3:a:uvnc:ultravnc:1.3.4.1
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cpe:2.3:a:uvnc:ultravnc:1.3.4.2
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cpe:2.3:a:uvnc:ultravnc:1.3.6.0
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cpe:2.3:a:uvnc:ultravnc:1.3.8.0
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cpe:2.3:a:uvnc:ultravnc:1.3.8.1
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cpe:2.3:a:uvnc:ultravnc:1.4.0.5
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cpe:2.3:a:uvnc:ultravnc:1.4.0.6
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cpe:2.3:a:uvnc:ultravnc:1.4.0.9
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cpe:2.3:a:uvnc:ultravnc:1.4.2.0
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cpe:2.3:a:uvnc:ultravnc:1.4.3.0
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cpe:2.3:a:uvnc:ultravnc:1.4.3.1
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cpe:2.3:a:uvnc:ultravnc:1.4.3.5
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cpe:2.3:a:uvnc:ultravnc:1.4.3.6
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cpe:2.3:a:uvnc:ultravnc:1.5.0.0
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cpe:2.3:a:uvnc:ultravnc:1.6.0.0
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cpe:2.3:a:uvnc:ultravnc:1.6.1.0
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cpe:2.3:a:uvnc:ultravnc:1.6.4.0
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cpe:2.3:a:uvnc:ultravnc:1.8.2.2