Safari in New Versions of iOS and macOS Includes Full Third-Party Cookie Blocking

safari iconSafari in macOS 10.15.4 and iOS and iPadOS 13.4 includes enhancements to Apple's Intelligent Tracking Prevention feature that allow for full third-party cookie blocking, Apple's WebKit team said today in a new blog post.

Cookies for cross-site resources are blocked by default in the new versions of Safari, introducing significant privacy improvements because it further cuts down on cross-site tracking functionality.

It might seem like a bigger change than it is. But we've added so many restrictions to ITP since its initial release in 2017 that we are now at a place where most third-party cookies are already blocked in Safari. To keep supporting cross-site integration, we shipped the Storage Access API two years ago to provide the means for authenticated embeds to get cookie access with mandatory user control. It is going through the standards process in the W3C Privacy Community Group right now.

The new cookie blocking feature makes sure there's no Intelligent Tracking Prevention state that can be detected through cookie blocking behavior as it removes statefulness, and it also prevents an attacker from seeing ITP status.

Safari's default cookie policy requires a third-party to have "seeded" its cookie jar as first-party before it can use cookies as third-party. This means the absence of cookies in a third-party request can be due to ITP blocking existing cookies or the default cookie policy blocking cookies because the user never visited the website, the website's cookies have expired, or because the user or ITP has explicitly deleted the website's cookies.

Thus, the absence of cookies in a third-party request outside the attacker's control is not proof that the third-party domain is classified by ITP.

Safari is the first mainstream browser to fully block third-party cookies by default, and Apple's WebKit team wants to pave the way for other browsers to do the same, so it plans to report on the experiences of full third-party cookie blocking to W3C privacy groups in an effort to help other browsers make the change as well.

More info on the changes implemented in Safari for iOS, iPadOS, and macOS today can be found in the full blog post.

Tag: Safari

Top Rated Comments

John.B Avatar
14 months ago
It's like a game of whack-a-mole, but I appreciate Apple pressing the issue.
Score: 8 Votes (Like | Disagree)
BWhaler Avatar
14 months ago
Thank you Apple and the Webkit Team.

While no company is perfect, it is a true gift to have the largest and best consumer tech company care so much about our privacy. There’s more money in selling us out, so I am grateful for the people of Apple taking a stand on principle.
Score: 8 Votes (Like | Disagree)
xxray Avatar
14 months ago
Thank you Apple. Please continue to find new ways to protect our privacy.
Score: 6 Votes (Like | Disagree)
farewelwilliams Avatar
14 months ago
Apple should have its own built-in VPN service.
Score: 5 Votes (Like | Disagree)
now i see it Avatar
14 months ago
Private Mode browsing works even better
Score: 4 Votes (Like | Disagree)
I7guy Avatar
14 months ago

It's like a game of whack-a-mole, but I appreciate Apple pressing the issue.
Exactly. I appreciate the focus on privacy as much as can be expected, by browsing the web.
Score: 4 Votes (Like | Disagree)

Top Stories

samsung experience 1

Samsung's 'iTest' Lets You Try a Galaxy Device on Your iPhone

Thursday April 8, 2021 12:42 pm PDT by
Samsung has launched "iTest," an interactive website experience that's designed to allow iPhone users to test out Android on a Galaxy device, or "sample the other side," as Samsung puts it. Subscribe to the MacRumors YouTube channel for more videos. The iTest website is being advertised in New Zealand, according to a MacRumors reader who came across the feature. Visiting the iTest website on...
pixel watch prosser leak

Google Pixel Watch Allegedly Leaks with Circular Design, Rumored to Launch in October

Monday April 12, 2021 2:49 am PDT by
Renders of Google's first smartwatch, codenamed "Rohan," have been shared by Jon Prosser, showing that Google plans to adopt a circular design for its flagship wearable watch. Prosser shared the renders in an episode of his YouTube show "Front Page Tech," in which he claims they were made based on marketing material he had seen from a source within Google. The renders show that the Pixel...
AppleTV and HomePod Feature

Bloomberg: Apple Working on New Apple TV With Integrated HomePod Speaker and FaceTime Camera

Monday April 12, 2021 3:32 am PDT by
Apple is working on a combined Apple TV with HomePod speaker that has a camera for video calls through a connected television set, according to Bloomberg's Mark Gurman. From the report: The company is working on a product that would combine an Apple TV set-top box with a HomePod speaker and include a camera for video conferencing through a connected TV and other smart-home functions,...
nba tracking prompt orange

Two-Thirds of iPhone Users Expected to Block Ad Tracking

Friday April 9, 2021 7:19 am PDT by
As many as 68 percent of iPhone users are expected to deny advertisers permission to track them thanks to Apple's App Tracking Transparency feature, in what is beginning to look like a significant blow to the advertising industry (via AdWeek). With the launch of iOS 14.5, apps will have to receive explicit user permission before accessing an iPhone's advertising identifier or IDFA, which is...
fake airpods 3

Counterfeit 'AirPods 3' Hit the Market Prior to Official Announcement

Friday April 9, 2021 2:45 am PDT by
Apple is expected to launch the third iteration of AirPods in the third quarter of this year. Rumors and reports suggest the new AirPods will feature an updated design more in line with the AirPods Pro, but lacking in "Pro" features such as active noise cancellation. Despite AirPods 3 not yet being officially announced by Apple, counterfeit products of the unreleased earbuds have already hit ...
Top Stories 56 Feature

Top Stories: 'Find My' Expansion, iPhone 13 Pro Mockup, Largest-Ever iMac?

Saturday April 10, 2021 6:00 am PDT by
Apple's AirTags may still be nowhere to be seen nearly two years after signs of them were first discovered, but Apple this week launched its Find My network accessory program that will let third-party devices integrate with the Find My app on Apple's platforms to make it easy to keep track of your items. This week also saw fresh rumors about the upcoming "iPhone 13" and new iMacs, while...
ehric

iPhone 12 Mini Missing From Top 5 Best Selling Smartphone List of January 2021

Friday April 9, 2021 4:58 am PDT by
According to market data compiled by Counterpoint Research, Apple's smallest iPhone since the 2016 iPhone SE, the iPhone 12 mini, struggled to obtain a spot in the top five list of best-selling smartphones in January of this year. According to the market data, the iPhone 12 mini came in eighth place for the best-selling smartphone worldwide in the first month of the year. However, the iPhone ...
sonny 2021 ipad mini pro dummies

Leaked Dummy Units Show iPad Mini 6 With Thick Bezels and Home Button, New iPad Pro Models

Thursday April 8, 2021 2:11 am PDT by
Rumors suggest Apple will release refreshed versions of the iPad mini and iPad Pro models in the first half of this year, potentially as soon as this month, and a new leak today has provided us with a possible preview of what to expect in terms of the devices' overall design and camera prospects. Tech leaker and Apple blogger Sonny Dickson this morning shared images on Twitter showing dummy ...
Google maps feaure green

Google Maps App for iOS Finally Updated After Four Months

Monday April 12, 2021 10:03 am PDT by
Following the completed rollout of App Privacy labels for its App Store apps, Google today updated the Google Maps app for the first time in four months. Apple in December began requiring all new app submissions and app updates to include App Privacy labels, detailing the data that is collected by the app so consumers know what they're sharing. Google didn't begin implementing App Privacy ...
epic iap feature 3

Tim Cook Says App Store Would Become a 'Flea Market' if Third-Party Payment Systems Were Allowed

Monday April 12, 2021 9:41 am PDT by
In a recent interview with the Toronto Star, Apple CEO Tim Cook spoke about a wide variety of topics, ranging from App Tracking Transparency to Apple's ongoing legal battle over App Store policies with Fortnite creator Epic Games. Notably, Cook said that Epic Games' desire for Apple to let developers offer their own payment systems in apps "would make the App Store a flea market":At the...