Security Fix.#3
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Running Challenges on iPhone!
Escape dynamic content used in progress messages, introduce a shared escape_html helper, and wire it into the extension and userscript so status/errors can't inject markup.
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Context
GitHub / CodeQL pointed this out.
Change
Escape dynamic content used in progress messages, introduce a shared escape_html helper, and wire it into the extension and userscript so status/errors can't inject markup.
Confirmation
Tests pass.