The CQC's registration process "was not effective in ensuring that all essential standards were being met" at University Hospitals Morecambe Bay NHS Foundation Trust, the Health Select Committee report states.
The maternity unit at one of the trust's hospitals - Furness General Hospital in Barrow, Cumbria - is at the centre of a police investigation concerning a number of deaths.
"It is failures such as those witnessed at Morecambe Bay which undermine public confidence in the CQC's essential standards," the report states.
More top news
A man who walked six miles a day to and from work was left astonished after a stranger presented him with a car bought from donations.
Police have charged Pope Francis's top financial adviser - Australia's most senior Vatican clergyman - with historical sex offences.
The scale of cyber crime is being underestimated because many cases are not reported to the police, according to the National Crime Agency.