macOS Monterey 12.2 and iOS 15.3 Release Candidates Fix Safari Bug That Leaks Browsing Activity - MacRumors
Skip to Content

macOS Monterey 12.2 and iOS 15.3 Release Candidates Fix Safari Bug That Leaks Browsing Activity

by

The macOS Monterey 12.2 and iOS 15.3 release candidates that came out today appear to address a Safari bug that could cause your recent browsing history and details about your identity to be leaked to malicious entities.

safari icon blue banner
As shared last week by browser fingerprinting service FingerprintJS, there is an issue with the WebKit implementation of the IndexedDB JavaScript API. Any website that uses IndexedDB can access the names of IndexedDB databases generated by other websites during the same browsing session.

The bug permits a website to spy on other websites that the user visits while Safari is open, and because some websites use user-specific identifiers in their IndexedDB database names, personal information can be gleaned about the user and their browsing habits.

Browsers that use Apple's WebKit engine are impacted, and that includes Safari 15 for Mac and Safari for iOS 15 and iPadOS 15. Some third-party browsers like Chrome are also affected on iOS and iPadOS 15, but the macOS Monterey 12.2, iOS 15.3, and iPadOS 15.3 updates fix the vulnerability.

FingerprintJS constructed a demo website to let users check to see whether they're impacted, and as 9to5Mac notes, after updating to the new software, the website detects no security holes.

The website is designed to tell users details about their Google accounts. On iOS 15.2.1 and macOS Monterey 12.1, we tested and the demo website was able to detect our Google account. After updating to the macOS Monterey 12.2 RC and the iOS 15.3 RC, the demo website no longer detects any data.

Apple earlier this week prepared a fix for the bug and uploaded it to the WebKit page on GitHub, so we knew that Apple was working to address the vulnerability. With the macOS Monterey 12.2 and iOS 15.3 release candidates now available, we could see these updates be made available to the public as soon as next week.

Tag: Safari
Related Forums: iOS 15, macOS Monterey

Popular Stories

Apple Skipping iPhone 18 This Year

Apple Skipping iPhone 18 Launch This Year

Wednesday August 12, 2026 6:59 am PDT by
Apple supplier Pegatron today indirectly confirmed that the standard iPhone 18 model will not be released until next year, according to a new report. Subscribe to the MacRumors YouTube channel for more videos. Pegatron held an earnings call for the second quarter of 2026 today. On the call, Taiwan's Economic Daily News said Pegatron indicated that one of its customers will be changing its...
Read Full Article • 69 comments
iPhone 18 Pro Rumored Colors

What's Coming in September: New iPhones, Apple Watches and More

Thursday August 13, 2026 4:20 pm PDT by
Apple will introduce at least five new devices at its iPhone-centric event next month, and it's also possible we'll get devices waiting on Siri AI like the Apple TV. iPhone 18 Pro The iPhone 18 Pro is going to look like the iPhone 17 Pro, but with a smaller Dynamic Island. It's getting some internal updates, including a new Wide camera with a variable aperture for more control over lighting ...
Read Full Article • 24 comments
Apple Event Logo

Apple Working on All-New Operating System

Tuesday August 11, 2026 1:11 pm PDT by
Apple is developing an all-new operating system that is essentially a mix of tvOS, watchOS, and iOS, according to Bloomberg's Mark Gurman. In a recent report, he said the operating system will feature a grid of icons, widgets, and apps, along with customizable clock faces. The new software platform is intended for Apple's long-rumored smart home hub. With built-in facial recognition, the...
Read Full Article

Top Rated Comments

D
Dave-Z
60 months ago

As discovered last week ('https://www.macrumors.com/2022/01/16/safari-15-webkit-indexeddb-bug/') by browser fingerprinting service FingerprintJS
It wasn't discovered last week. It was discovered last year, November 2021. It was disclosed to the public last week.


we knew that Apple was working to address the vulnerability in a timely manner
Addressing the issue nearly two months after it having been reported is not timely, especially considering this patch still hasn't reach the public. If the update comes out in one week that will have been two months since Apple first learned about it.
Score: 31 Votes (Like | Disagree)
centauratlas Avatar
centauratlas
60 months ago
"address the vulnerability in a timely manner.".

But is it really timely? Sure, timely since it was made public, but was it timely since they first were informed of it? I'd say no.
Score: 16 Votes (Like | Disagree)
C
CaTOAGU
60 months ago
It really does feel a bit silly that we’re still having to wait on OS level updates to fix a bug in a web browser.
Score: 15 Votes (Like | Disagree)
IGI2 Avatar
IGI2
60 months ago

It wasn't discovered last week. It was discovered last year, November 2021. It was disclosed to the public last week.



Addressing the issue nearly two months after it having been reported is not timely, especially considering this patch still hasn't reach the public. If the update comes out in one week that will have been two months since Apple first learned about it.
But to be fair, Google Project Zero (and others) has a disclosure policy of 90 days.

We know that this is a privacy breach, but still, modern OSs are fairly complex. Getting to know about it, analysis, fixing it, incorporating in all variants, QA testing, and distributing it to all end users across the globe in one time, whether it's iPhone 6s or iPhone 13 Pro Max is still within reasonable "timely" manner.

We know that they had some public pressure; that's why it's even shorter if we count days since it landed in the news.
Score: 9 Votes (Like | Disagree)
beanbaguk Avatar
beanbaguk
60 months ago
To all those members complaining about the "timely manner" statement. I would say this is very timely and your complaints indicate you have no experience in software development.

I've been in software development for many years (I am a Head of Product at a software technology company), and patching something isn't just a 5-minute job, even if you know what the issue is and how to fix it.

A small change on an API will impact many, many areas of a product and this means thorough testing is required, and diligence of any related libraries and products.

This is hugely time-consuming and since this product impacts so many platforms, it's not just a case of patching and letting it go into the wild. Especially in this instance, a security audit would have to also be conducted to show the result works, and this would have to be verified by multiple organisations.

Then, the patch has to be tested to ensure it deploys safely and correctly over the air. That update process takes time to implement, manage and check. It then needs checking again, more testing and feedback from users (beta), and devs to ensure they are not experiencing any issues. Again, all this takes time.

I hope this provides some perspective as to how and why these fixes take a little time.

It reminds me of the days when I used to build websites for clients. Talking to an individual who has zero ideas as to the complexities of a solid product is the most infuriating and patience-testing experience as a developer.

Anyway. Two months for a fix like this on this scale is perfectly acceptable.
Score: 8 Votes (Like | Disagree)
Macintosh TV Avatar
Macintosh TV
60 months ago
Mozilla has security issues that are more than 2 years old and filed in their system. Chrome has outstanding security issues older than this. Folks need to settle down. This stuff happens. It gets fixed. If you're unhappy with the speed at which a browser or OS patches issues, then it may be time to look elsewhere.
Score: 8 Votes (Like | Disagree)
Read All Comments