The social network has confirmed it is aware of the bug and says it will submit a software fix for the issue to Apple.

A screen recording of the bug, which appeared to show the iPhone camera opening in the background of the Facebook app, was posted to Twitter earlier this week, sparking security and privacy concerns among users.

The bug appears to be limited to the version of the Facebook app available on Apple's iOS.

In response to concerns, Facebook said the bug was the result of an earlier software update to fix another bug found in its iOS app.

"We recently discovered that version 244 of the Facebook iOS app would incorrectly launch in landscape mode," a Facebook spokeswoman said.

"In fixing that issue last week in v246 (launched on November 8) we inadvertently introduced a bug that caused the app to partially navigate to the camera screen adjacent to News Feed when users tapped on photos.

"We have seen no evidence of photos or videos being uploaded due to this bug. We're submitting the fix for this to Apple today."

Further responding to discussion of the bug on Twitter, Facebook's vice president for integrity Guy Rosen reiterated the company had "no evidence" of any photos or videos being stored to Facebook servers or being uploaded because of the flaw.

The social media giant has been at the centre of a number of privacy and security issues in recent years - most notably the Cambridge Analytica data scandal.

Facebook has also previously been the subject of claims that it listens in to users' audio in order to target them with advertising, something the company has repeatedly denied.

Australian Associated Press