  void SetUsageStat(DWORD value, bool medium) {
    ASSERT_TRUE(!medium || system_level_);
    ASSERT_EQ(ERROR_SUCCESS,
              base::win::RegKey(root_key_, GetUsageStatsKeyPath(medium).c_str(),
                                KEY_SET_VALUE | KEY_WOW64_32KEY)
                  .WriteValue(L"usagestats", value));
  }

The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.