Security Update 2020-005 bugs—don't install!

I was hit on this with a Mac I wiped on Friday. Today could not run Migration Assistant nor add a user account. Since there was no data on this iMac I am wiping it now. 2013 iMac with fusion drive.

Apple released a security update for Mojave users a day or two ago. It is causing major problems for users and it is strongly recommended that you avoid it entirely:

I made the mistake of installing it, and now my iMac is running slow and flaky. I REALLY regret installing it.

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By coincidence I wiped an iMac Friday and installed 10.14.6 and all updates. This morning I could not use Migration Assistant nor could I create a new user account. I couldn’t find anything in my searches on the web but this article explains why I encountered problems. Thank you for posting it.

What went wrong with Mojave Security Update 2020-005, and Catalina 10.15.7?

Hmmm, this discussion should also include the simultaneous release of Safari 14, which for many on Mojave was a disaster piled upon more disasters, all occurring at once. And for those unfortunates, no clear cause of the problems.

Indeed, but please keep the discussion of Safari 14 in that topic:

Indeed, there has been mounting evidence provided by Enterprise Mac IT testing that these issues are only showing up when Safari 14 is installed before Security Update 2020-005 (or 2020-004 and probably even earlier Security Updates), the Security Update is apparently overwriting some portions of WebKit which impacts Safari, Mail and other functions that use WebKit in order to function properly.


Apple rang as scheduled. Spent another couple of hours testing various engineering-directed options. Unsuccessful. Further diagnostics run, follow-up call scheduled for 5 October.

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Mojave 2020-005 Security Update no longer shows in Software Update for me. Looks like it has been pulled ("page you’re looking for can’t be found):

Good riddance.

Both Security Update 2020-005 (Mojave) and Safari 14 for Mojave were pulled from the Software Update catalog yesterday. They should return after fixed shortly.

Late this evening, Security Update 2020-005 (Mojave) and macOS Supplemental Update 10.14.6 (which includes Safari 14) was re-posted to the Software Update catalog and should be available to users. So far I’m only seeing the Supplemental, but it probably needs to be installed first.

I recommend most users wait for the experience of others before installing either of these.

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Update: Have now installed macOS Supplemental Update 10.14.6

I can now:

  • create new admin and standard User Accounts via System Preferences
  • see new User Accounts in System Preferences > Users & Groups and Macintosh HD/Users
  • log into the new User Accounts and they seem to function OK
  • delete the newly created User Accounts via System Preferences

I cannot see the test User Accounts created between installing the original Security Update 2020-005 last week and installing macOS Supplemental Update 10.14.6 in either System Preferences > Users & Groups or Macintosh HD/Users. However, they remain visible using Terminal <dscl . list /users>. They can be deleted using Terminal <sudo dscl . delete /users/Username>

Please note: the inability to see newly created users was the only bug I had. I don’t know whether the Supplemental Update has fixed other problems reported by various people.

Cheers, Gobit

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As far as I’ve been able to determine, the Supplement mostly (maybe only) provides an update to Safari 14 that’s designed to withstand the installation of Security Update 2020-005 (Mojave) which you should be able to see available now that you’ve installed the Supplement. I don’t believe it corrected any of the issues caused by installing the original Security Update 2020-005, so it’s not surprising that new user accounts are working normally. You will need to re-install Security Update 2020-005 before you can determine that the issue is resolved.

Hmm, no Security Update 2020-005 or any other updates appearing in Software Update for me (besides the usual Catalina upgrade option)

Confirmed. Not immediately seeing any reason after scanning 001-48327.English.dist file. I notified my sources and will let them try to figure it out as it’s too late for me tonight.

I forgot that I had previously used sudo softwareupdate --ignore "Security Update 2020-005" which is why I wasn’t seeing it. Using sudo softwareupdate --reset-ignore fixed that so that I now see Security Update 2020-005 in System Preferences->Software Updates.

Mr. Macintosh has an article that should outline all possible scenarios

I’ve installed the new update and the three problems that I noticed (cannot create a new local user; cannot update apps in the Mac App Store; unusually large amount of RAM used by WindowServer process) are all fixed. I never had issues with slow boot, fan speeds, slowness in the Finder, and I never tried a user migration. All seems fine now.

Same for me. But I had already installed 2020-005. For me there is not an updated version (at least not yet.) (I never ran "sudo softwareupdate --ignore “Security Update 2020-005”).

Likewise. The Supplemental seems to have contained everything needed for the fix in my case.

Security Update 2020-005 (Mojave) was not updated. It’s exactly the same one that was released earlier, taken down and then re-posted, so since you had already installed it, you will never see it again.

Ok. I was confused by what you posted earlier:

That reads as if I should have seen the 005 security update to install again.