"Facebook not supported" in Safari after update Ventura 13.4.1.a

The update was pulled. Article on MacRumors.

You can remove it in the meantime. I did and all is well again.

Go to Settings->About and click the i next to the OS version. You’ll see an option to remove the update.

Im sure a fixed update will be available soon.

And as a verification that the problem still exists -

macOS Ventura 13.4.1 (a)

Released July 10, 2023

WebKit

Available for: macOS Ventura 13.4.1

Impact: Processing web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.

Description: The issue was addressed with improved checks.

CVE-2023-37450: an anonymous researcher

This update fixes a webkit issue. So I suspect it will be Facebook that has to make a change, not Apple. Most reports are about Facebook. In my personal experience it’s only Facebook, all other websites I visit regularly are fine.

And who knows what games Facebook plays with its website. Maybe Apple just closed a Facebook back door.

And who knows what games Facebook plays with its website. Maybe Apple just closed a Facebook back door.

And Facebook was responsible for the previous bug where the news feed kept going and going and going all on its own. Took them about two weeks to fix it.

This just happend to me today 7/10/23. Yesterday Facebook was normal. Today I get the "Facebook not supported" message and Facebook shows up in a single column in the center of the display. Not very useable. What is going on here? Apple technical support had no idea, and said it's not their problem. I wonder if there is anybody at Facebook who can help with this, or even cares about this.

I have no intention of removing the update because I value the security patch more than accessing Facebook and WhatsApp, and all of the routine websites I regularly visit are just fine. I’ll simply wait for the “patched patch” to be released.

lkrupp wrote:

The word on the street from the experts is that the (a) in the version number is the culprit causing some websites to become confused. That tells me the patch itself is good.

FWIW, if the security issue the RSR addressed was in any way critical, I seriously doubt Apple would have pulled it.

Instagram, WhatsApp and Zoom aren't sites I normally (or ever) use, but I visited each one just now and they all appear normal to me.

This based on opening all three sites in Safari, Firefox and Brave. They all display the same, as does Facebook.

Facebook doesn't support Safari 17.1 on Monterey 12.7.1, either. Facebook must have decided it doesn't need to run on MacOS Safari.

Other Web sites are also freezing on Safari 17.1.

I guess this means a switch to Chrome.

I have the same issue. And it's not only on Facebook, but also on Whatsapp web. It asks me to update Safari... See screenshot

Today - under Ventura 13.4.1 (c) - now getting what I believe is a related issue. It isn't affecting all of Facebook - but this:

Try a different browser.

Then I would stick with Chrome or Firefox.