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The kiosk page interpolates style.fontFamily and style.background into a <style>
block, escaped with escapeHtml. That is the wrong tool twice over: it escapes
& < > " ' but not { } ;, and inside a raw-text <style> element the entities it does
produce are never decoded, so it neither contains the value nor renders it correctly.
A value could therefore close the declaration, close the rule, and append its own —
putting an attacker-chosen rule on every panel showing the page. There is no XSS,
since </style> stays unreachable, but a url() in an injected rule is an outbound
request from every display, which is a beacon and a cross-site tracking channel.
Both values are now checked structurally rather than against a value allowlist,
because background is a free-text field: linear-gradient(), rgb() and url() are all
legitimate and keep working. Only characters that could terminate the declaration or
open a new rule are refused, along with comment syntax (which can swallow the
declarations that follow) and control characters. font-family needs no parentheses,
so it gets a tighter allowlist.
Tests cover both directions — injection refused and falling back to the default, and
ordinary gradients, colours and font stacks passing through untouched.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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| .. | ||
| activity.js | ||
| admin.js | ||
| agency.js | ||
| ai.js | ||
| assignments.js | ||
| auth.js | ||
| billing.js | ||
| contact.js | ||
| content.js | ||
| device-groups.js | ||
| devices.js | ||
| folders.js | ||
| kiosk.js | ||
| layouts.js | ||
| media.js | ||
| pip.js | ||
| player-debug.js | ||
| playlists.js | ||
| provisioning.js | ||
| reports.js | ||
| schedules.js | ||
| status.js | ||
| stripe.js | ||
| subscription.js | ||
| teams.js | ||
| tokens.js | ||
| video-walls.js | ||
| white-label.js | ||
| widgets.js | ||
| workspaces.js | ||