Figured I'd share this here as I already have on another platform. Been using PanOS for ~8 years and came across something with URL filtering and wildcards. URL filters with wildcards will match on the front, and back of the URL(implicit), if you don't use the trailing /.
What this means is *.microsoft.com doesn't just match www.microsoft.com, but also www.microsoft.com.uk. BUT, it also matches www.microsoft.com.malware.com (tested in a lab environment - feel free to test in yours) - it doesn't stop at domain 'extensions'
Note - this is by design and something in PanOS release notes back to 5.x (that I was able to dig up), so nothing to open a case with PA for a bug.
Not a huge issue with block lists as you'll just be blocking more than you intend to, but for allow lists - could be a bit of a problem. Worth a review of your allow lists for sure, as custom categories will be processed before pandb classification.
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