Facebook has just disclosed yet another leak, this time affecting millions of users' private photos.

The social media platform said Friday that it discovered a bug that may have given up to 1,500 third-party apps improper access to photos from up to 6.8 million users. Normally, the apps would only be permitted to access photos that a user has actually posted on their Facebook timeline, but because of this bug, the apps could access pictures that weren't publicly posted. This would include pictures shared on Facebook's Marketplace or on Facebook Stories, as well as pictures that a user uploaded but didn't end up posting.

The apps had access to these photos for 12 days in September 2018, Facebook says. This issue would have only affected users who authorized the app to access photos. "We're sorry this happened," Facebook said. You can find out whether any of your pictures were affected by the bug here.

This is just the latest security scandal for Facebook, which is still reeling from revelations earlier this year that a political consulting firm, Cambridge Analytica, was able to gain access to Facebook users' private information. Facebook CEO Mark Zuckerberg told Congress the scandal was "my mistake, and I'm sorry." Brendan Morrow