Apple Releases Revised iOS and macOS Security Updates to Fix Actively Exploited Vulnerability and Safari Bug - MacRumors
Skip to Content

Apple Releases Revised iOS and macOS Security Updates to Fix Actively Exploited Vulnerability and Safari Bug

Apple today released updated Rapid Security Response (RSR) fixes that are available for iPhone and iPad users running the iOS and iPadOS 16.5.1 updates and the macOS Ventura 13.4.1 update.

Rapid Security Response Feature 1
Rapid Security Response updates are designed to provide iOS and macOS users with security fixes without the need to install a full software update. Today's updates address an actively exploited WebKit vulnerability, so it is a good idea to update as soon as possible.

iOS Security Response 16.5.1 (c) and macOS Ventura Security Response 13.4.1 (c) are available through the standard Software Update mechanism in the Settings app. These are quick updates, requiring just a couple of minutes to download the update and then a restart for the install process.

Once the Rapid Security Response update is installed, iOS 16.5.1 users and macOS Ventura 13.4.1 users will see an updated version of the software, and tapping on the version in the About section of Settings will display information about the installed OS version and the Rapid Security Response update. Those who want to disable Rapid Security Response updates on iPhone can do so by following our how to. The updates can also be disabled on the Mac.

Apple initially introduced these Rapid Security Response updates earlier in the week, but the way they were named caused issues with Safari. Select websites like Facebook, Instagram, WhatsApp, Zoom, and more began giving a warning about not being supported on the Safari browser following the software installation.

As a result, Apple pulled the RSRs pending a fix and provided information to users on how to remove the updates. The new (c) RSRs will not cause the same Safari issue.

Popular Stories

macOS 27 on MacBook Pro

macOS 27 Will Mark the End of an Era

Saturday April 18, 2026 6:45 am PDT by
During its Platforms State of the Union segment at WWDC 2025, Apple revealed that macOS 26 Tahoe is the final major macOS version for Intel-based Macs. The upcoming macOS 27 release will be compatible with Apple silicon Macs only, meaning that you will need a Mac with an M-series chip or a MacBook Neo with an A18 Pro chip in order to install the software update. macOS 27 should be available...
Aston Martin CarPlay Ultra Screen

Apple Says CarPlay Ultra is Coming to These Vehicle Brands

Saturday April 18, 2026 5:59 am PDT by
Last year, Apple launched CarPlay Ultra, the long-awaited next-generation version of its CarPlay software system for vehicles. Nearly a year later, CarPlay Ultra is still limited to Aston Martin's latest luxury vehicles, but that should change fairly soon. In May 2025, Apple said many other vehicle brands planned to offer CarPlay Ultra, including Hyundai, Kia, and Genesis. CarPlay Ultra...
Tim Cook Rainbow

Apple CEO Tim Cook Stepping Down, John Ternus Taking Over

Monday April 20, 2026 1:33 pm PDT by
Apple CEO Tim Cook is stepping down as Apple's chief executive officer, and hardware engineering chief John Ternus is set to take over, Apple announced today. Cook will continue on as Apple CEO through the summer, with Ternus set to join Apple's Board of Directors and take over as CEO on September 1, 2026. Cook is going to transition to executive chairman, and he will "assist with certain...

Top Rated Comments

36 months ago

(a) was buggy, and now they release (c)... how bad was (b)??
a for alpha, b for beta and c for courage.
Score: 43 Votes (Like | Disagree)
lostczech Avatar
36 months ago
(a) was buggy, and now they release (c)... how bad was (b)??
Score: 34 Votes (Like | Disagree)
TheYayAreaLiving 🎗️ Avatar
36 months ago
I'm scared to download this update. Anyone on the same boat?



Attachment Image
Score: 19 Votes (Like | Disagree)
36 months ago

I'm scared to download this update. Anyone on the same boat?


Go for it. C stands for courageous!
Score: 13 Votes (Like | Disagree)
antiprotest Avatar
36 months ago

(a) was buggy, and now they release (c)... how bad was (b)??
With (b) you lost access to check rapid response updates that's why we never heard from it again.
Score: 13 Votes (Like | Disagree)
antiprotest Avatar
36 months ago
Ah yeah let's all trust Apple again
Score: 12 Votes (Like | Disagree)