Apple Releases iOS 15.3 and iPadOS 15.3 With Fix for Safari Bug That Leaks Browsing Activity

Apple today released iOS 15.3 and iPadOS 15.3, the third major updates to the iOS and iPadOS 15 operating systems that were released in September 2021. iOS and iPadOS 15.3 come almost two weeks after the release of iOS and iPadOS 15.2.1, minor bug fix updates.

ios 15
The iOS 15.3 and iPadOS 15.3 updates can be downloaded for free and the software is available on all eligible devices over-the-air in the Settings app. To access the new software, go to Settings > General > Software Update.

According to Apple's release notes, iOS 15.3 includes "bug fixes and security updates for your iPhone," with Apple recommending the software for all users.

Apple will have a full list of security updates on its website, but today's iOS and iPadOS 15.3 updates specifically address a recently publicized Safari exploit.

In iOS 15 and iPadOS 15, there is an issue with the WebKit implementation of the IndexedDB JavaScript API. Websites that use IndexedDB can access the names of IndexedDB databases generated by other websites during the same browsing session, which essentially allows a malicious website to spy on other websites that a Safari user visits.

iOS 15.3, iPadOS 15.3, and macOS Monterey 12.2 fix this Safari bug, which also impacted Chrome and other browsers on iOS devices. With the fix, the vulnerability can no longer be used to glean recent browsing history and identity details from Safari users.

Related Forum: iOS 15

Popular Stories

iPhone 17 Pro and Air Feature

Two iPhone 17 Pro and iPhone Air Colors Appear to Scratch More Easily

Friday September 19, 2025 10:02 am PDT by
As reported by Bloomberg today, some of the new iPhone 17 Pro and iPhone Air models on display at Apple Stores today are already scratched and scuffed. French blog Consomac also reported on this topic. The scratches appear to be most prominent on models with darker finishes, including the iPhone 17 Pro and Pro Max in Deep Blue, and the iPhone Air in Space Black. Images Credit: Consoma ...
iOS 26

Everything New in iOS 26.1 Beta 1

Monday September 22, 2025 12:44 pm PDT by
Apple released the first beta of iOS 26.1 today, just a week after launching iOS 26. iOS 26.1 mainly adds new languages to Apple Intelligence, but there are a few other features that are worth knowing about. New Apple Intelligence Languages Apple Intelligence is now available in Danish, Dutch, Norwegian, Portuguese (Portugal), Swedish, Turkish, Chinese (Traditional), and Vietnamese. AirPo...
Apple Foldable Thumb

Foldable iPhone Like 'Two Titanium iPhone Airs' Joined at the Hinge

Monday September 22, 2025 2:16 am PDT by
Next year's rumored foldable iPhone will showcase an ultra-thin design resembling "two titanium iPhone Airs side-by-side," according to Bloomberg's Mark Gurman. Writing in the Q&A section of his latest Power On newsletter, Gurman says Apple's first foldable device will be "super thin and a design achievement," combining Apple's thinnest iPhone form factor with cutting-edge folding...
iOS 26

iOS 26.0.1 Coming Soon, Likely With iPhone Air and iPhone 17 Pro Fix

Thursday September 18, 2025 9:17 am PDT by
Apple is preparing to release iOS 26.0.1, according to a private account on X with a proven track record of sharing information about future iOS versions. The update will have a build number of 23A350, or similar, the account said. It is likely that iOS 26.0.1 will fix a camera-related bug on the new iPhone Air and iPhone 17 Pro models. In his iPhone Air review, CNN Underscored's Henry T. ...
iPhone 17 Pro and Air N1 Feature

Some iPhone 17, iPhone 17 Pro, and iPhone Air Users Experiencing Intermittent Wi-Fi Issue

Monday September 22, 2025 8:44 am PDT by
Apple's latest iPhone models launched on Friday, and some early adopters of the devices are experiencing intermittent Wi-Fi issues. Affected customers say Wi-Fi connectivity periodically cuts out on the iPhone 17, iPhone 17 Pro, iPhone 17 Pro Max, and iPhone Air, with hundreds of comments about the issue posted across the MacRumors Forums, Reddit, and the Apple Support Community over the...
Apple Intelligence General Feature 2

iOS 26.1 Adds New Apple Intelligence Languages and Expands AirPods Live Translation

Monday September 22, 2025 11:15 am PDT by
With iOS 26.1, Apple Intelligence is gaining support for additional languages, including Danish, Dutch, Norwegian, Portuguese (Portugal), Swedish, Turkish, Chinese (Traditional), and Vietnamese. Apple announced plans to expand the languages that can be used with Apple Intelligence last year, and now the added language support is here. Apple Intelligence is now available in the following...

Top Rated Comments

DinkThifferent Avatar
48 months ago
Here come the 'I don't see it yet'-comments.





I don't see it yet, here in The Netherlands.
Score: 21 Votes (Like | Disagree)
orbital~debris Avatar
48 months ago

MacOS 12.2 is also out
I know iOS/iPadOS is the leading software product for Apple these days, but I do miss when macOS news had prominence on MacRumors and the Mac web.
Score: 10 Votes (Like | Disagree)
TheYayAreaLiving ?️ Avatar
48 months ago
Yay! Finally. Been waiting for this update for a while. Happy updating!!!
Score: 9 Votes (Like | Disagree)
Hombre53 Avatar
48 months ago
Here is the full list of updates today from Apple, Courtesy of Mr MacIntosh:

[HEADING=1]Full Apple OS Release list[/HEADING]

* 1. iOS 15.3 (19D50)
* 2. iPadOS 15.3 (19D50)
* 3. tvOS 15.3 (19K547)
* 4. HomePodOS 15.3 (19K547)
* 5. watchOS 8.4 (19S546)
* 6. Monterey 12.2 (21D49)
* 7. Big Sur 11.6.3 (20G413)
* 8. Catalina 2022-001 (19H1712)
* 9. Xcode -
Score: 8 Votes (Like | Disagree)
randolorian Avatar
48 months ago
I'm surprised they are releasing this amid the ongoing iCloud issues.
Score: 7 Votes (Like | Disagree)
TheYayAreaLiving ?️ Avatar
48 months ago

Here we go!
It's a big update 1.6GB sheeeesh! Have fun updating ?
Score: 6 Votes (Like | Disagree)