Security: Reflected XSS via innerHTML using URL parameters#3053
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The `applyTranslations` function reads URL parameters `mainHeading` and `mainSpan` and directly inserts them into the DOM using the `innerHTML` property. This occurs after decoding the URI component. An attacker can craft a malicious URL containing JavaScript payloads within these parameters. When a victim visits the crafted URL, the script will execute in the context of the victim's browser, leading to reflected Cross-Site Scripting (XSS). Signed-off-by: tomaioo <203048277+tomaioo@users.noreply.github.com>
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Summary
Security: Reflected XSS via innerHTML using URL parameters
Problem
Severity:
High| File:src-node/www/phoenix-splash/error.html:L9The
applyTranslationsfunction reads URL parametersmainHeadingandmainSpanand directly inserts them into the DOM using theinnerHTMLproperty. This occurs after decoding the URI component. An attacker can craft a malicious URL containing JavaScript payloads within these parameters. When a victim visits the crafted URL, the script will execute in the context of the victim's browser, leading to reflected Cross-Site Scripting (XSS).Solution
Avoid using
innerHTMLwith untrusted input. Instead, usetextContentordocument.createElementto safely construct the DOM elements. If HTML formatting is strictly required, sanitize the input using a robust HTML sanitization library like DOMPurify before insertion.Changes
src-node/www/phoenix-splash/error.html(modified)