CVE-2026-7839

EIP tracks 1 public exploit for CVE-2026-7839. PoCs published by HermesNA-1.

AI-analyzed exploit summary This repository contains an auto-generated stub module for CVE-2026-7839, a hardcoded default password vulnerability in UltraVNC repeater's HTTP administration server (versions through 1.8.2.2). The code includes placeholder methods (`check()` and `run()`) but lacks actual exploit implementation, referencing only a TODO for PoC development.

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.