On Monday the SEC Office of Inspector General released its Semiannual Report to Congress regarding ongoing and completed investigations at the SEC. As described here, the biggest investigation to come from the OIG this year was with respect to the Bernard Madoff Ponzi Scheme, but the Report also details several ongoing internal investigations.
The ongoing investigations range from somewhat minor allegations of misuse of email and failure to maintain a proper bar license to significantly more serious allegations of fraud, abuse of power, conflicts of interest, and investigative misconduct. Perhaps the most serious allegations involve two SEC attorneys accused of disclosing non-public information about SEC enforcement investigations to a corrupt FBI agent and short seller who have subsequently been convicted of several crimes.