Data was sent in XML format through the stock check feature:

When we inserted a tick ('), we received an “attack detected” message:

Attempts to enumerate columns were blocked by the WAF:

We then used the Hackvertor extension. By highlighting the input, right-clicking, and selecting Extensions > Hackvertor > Encode > dec_entities/hex_entities, we were able to bypass the WAF:

We also used Hackvertor to see how the input appeared in the output when encoded in hex:

Manual encoding also worked:

Finally, we logged in as admin and solved the lab: