What's this CSSM Exception in my macOS 10.12.1 logs?
I have found these errors to relate to old keychain data references. I was able to stop most of these CSSM Exceptions from appearing by opening Keychain Access and deleting any empty keychains.


Agreed- my CSSM Exception errors went away when I got rid of some defunct Adobe Air keychain references. The references were particularly defunct, as I had recently deleted the files to which they referred, to get rid of a previous slew of log messages...!

Interestingly, Keychain Access did not immediately disappear the keychains when I asked it to delete them; I deleted them (I tried both "Reference only", and "Reference and Files" (even though I'd manually deleted the files...!)), and they remained visible. So I quit and reopened Keychain Access- and they were gone :-) And so were the CSSM log messages :-)