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The error page reflected URL params back via innerHTML, so a crafted
URL could inject arbitrary HTML/JS. Switch to safe DOM construction
(textContent + createElement) and reduce the strings to plain text
with a "\n" line-break marker and a "{0}" placeholder for the
phcode.io link, which the page now builds as a hardcoded anchor.
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The error page reflected URL params back via innerHTML, so a crafted URL could inject arbitrary HTML/JS. Switch to safe DOM construction (textContent + createElement) and reduce the strings to plain text with a "\n" line-break marker and a "{0}" placeholder for the phcode.io link, which the page now builds as a hardcoded anchor.