api people - #39
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frederic34
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Jul 29, 2026
Google Drive file and folder names are attacker-controlled: anybody sharing a folder with the connected account picks its name. Breadcrumb: the name was concatenated into a string injected with .html(), so a folder named "<img src=x onerror=alert(1)>" ran script on every re-render. Escape it through a text node first. onclick handlers: dol_escape_js() protects the JS string literal but not the surrounding HTML attribute, and the browser HTML-decodes the attribute before parsing it as JS. A name containing "'" therefore became a real quote and broke out of the argument. Build the handler first, then HTML-escape it as a whole. Uses dol_escape_htmltag($s, 0, 0, '', 1): in its default mode dol_escape_htmltag() re-emits the literal sequence "'" untouched (it hides it behind __SIMPLEQUOTE__ so htmlentities() never encodes the &), which leaves exactly this attack open. $escapeonlyhtmltags=1 has no such carve-out.
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