This was reported to us earlier this week. iOS 26.x appears to break or override applied JAMF content filtering profiles with the addition of an “Add Website to Allowed List” button that appears on blocked websites.
Thankfully this only seems to apply when using a content filtering profile set to “Limit Adult Content” and not the more restrictive “Specific Websites Only” setting, but if you’re blocking websites with the former and a user navigates to a restricted site, they can just tap this button and it overrides the applied profile to grant them access.
Getting A LOT of complaints from some of our buildings that students are exploiting this to access websites that had previously been blocked. Not sure what Apple’s thought process was in adding this button...