(RTTNews) - Facebook Inc. (FB) said that a software bug exposed the photos of up to 6.8 million users, including pictures they had not posted.

The company said its internal team discovered a photo API bug that may have affected people who used Facebook Login and granted permission to third-party apps to access their photos. It has fixed the issue but, because of this bug, some third-party apps may have had access to a broader set of photos than usual for 12 days between September 13 to September 25, 2018.

Facebook said, “When someone gives permission for an app to access their photos on Facebook, we usually only grant the app access to photos people share on their timeline. In this case, the bug potentially gave developers access to other photos, such as those shared on Marketplace or Facebook Stories. The bug also impacted photos that people uploaded to Facebook but chose not to post. For example, if someone uploads a photo to Facebook but doesn’t finish posting it - maybe because they’ve lost reception or walked into a meeting - we store a copy of that photo for three days so the person has it when they come back to the app to complete their post.”

Currently, Facebook believed this may have affected up to 6.8 million users and up to 1,500 apps built by 876 developers. The only apps affected by this bug were ones that Facebook approved to access the photos API and that individuals had authorized to access their photos.

Facebook said, “We’re sorry this happened. Early next week we will be rolling out tools for app developers that will allow them to determine which people using their app might be impacted by this bug. We will be working with those developers to delete the photos from impacted users.”

Facebook noted that it will also notify the people potentially impacted by this bug via an alert on Facebook.

The company is also recommending people log into any apps with which they have shared their Facebook photos to check which photos they have access to.