Expired WWDR certificate and Safari Extension Builder

Yes, I'm seeing the same.

I'm having the same problem, see the discussion here: https://forums.developer.apple.com/thread/37232

I've also opened up a support request with Apple.. I'll post a solution here if it gets resolved.

Same issue here. It seems that Safari's Extension Builder is actually reinstalling the expired certificate the first time it's opened. I'm currently using OS X 10.11.3 and Safari 9.0.3, the latest release of each. Here are the initial steps I tried:

• Open Keychain Access
• Select View > Show Expired Certificates
• Search for Apple Worldwide, select any expired certificates and delete them
• Restart computer
• Open Keychain Access to verify expired certificate is still gone, and Safari Developer certificate says it's valid
• Open Safari
• Choose Develop > Show Extension Builder
• Selecting an extension shows "No Safari Extensions Certificate"

At this point I can now reproduce the problem very easily:

• Quit Safari
• Delete the expired certificate again
• Open Safari
• Open Extension Builder

The expired cert will reappear every time. This time I think Extension Builder actually displayed very briefly that I had a valid certificate—probably in the brief moment before it was able to reinstall the expired certificate again.

So, clearly the problem is with Safari itself. The next question is whether Apple can fix this on their servers or if an update to the app will be needed. I'm curious if it's fixed in the latest 10.11.4 beta—does anyone have that installed so they could check?

Same here. I filed a bug: https://openradar.appspot.com/24672726

What about Windows PCs. Does anybody found a solution?

I'm still getting "No Safari Extensions Certificate" in 10.11.4 Beta 6 (15E61b)

My certs are valid and expired certs have been removed.

The expired cert is not re-added by Safari, but it fails to notice the valid one?

Anybody else?

I'm stil having this problem.

I've removed everything, but every time I open the extension builder, it adds back the expired certificate.

Is anyone still seeing this?

This is the latest El Capitan and Safari.