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CVE-2026-7839

critical CVSS 9.1 EPSS 0.7%

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.

Versions it affects

Software versions checked with the free lookup that CVE-2026-7839 applies to, and the release that fixes it where the sources name one.

UltraVNC 1.3.0.0

At a glance

Severity
Critical
CVSS base score
9.1 out of 10
Known exploited
Not in CISA's catalogue of exploited vulnerabilities
EPSS
0.7% probability of exploitation in the next 30 days, higher than 50% of scored vulnerabilities
Weakness
CWE-798
Published
2026-07-01
NVD CVE.org

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