Glow, a fertility-tracking app founded by a well-known Silicon Valley technologist, warned users today of a privacy loophole that may expose personal data. The company said its "connect a partner" feature, which lets the app user give access to a partner, might have made some of the shared data accessible to third parties.

Glow described it as a "low risk" of data exposure, potentially impacting less than 0.15 percent of the app's four million users. In a statement to The Verge, the company said that there is no evidence suggesting their data has been compromised.

They've issued a fix to the loophole in the app, which was in the email verification process, and is urging all users to change their passwords and update their apps.

Glow launched in 2013 and received a fair amount of attention (perhaps more than the dozens of other fertility-tracking tools out there) because of the minds behind it: Max Levchin, of PayPal fame, is co-founder and executive chairman of the company behind the app. Levchin and CEO Mike Huang also created a non-profit arm of Glow that funded fertility treatments for Glow users.