HTML5 storage manipulation (stored DOM-based)
Summary: PortSwigger Research describes HTML5 storage manipulation as a stored DOM-based issue where a script writes attacker-controllable data into the browser's localStorage or sessionStorage, letting an attacker construct a URL that causes another user's browser to store that data. The storage itself is not a vulnerability, but if the application later reads the data back and processes it unsafely, it can deliver cross-site scripting and JavaScript injection, and Burp Suite flags it through dynamic and static analysis that can produce false positives.
Why it matters: The data sits in the user's own browser storage, so a payload planted through a crafted URL can persist and resurface on later page loads, and PortSwigger notes static analysis alone may flag issues that are not actually exploitable - meaning your team has to trace the read-back path in client-side code to know whether it is real.
Read the original at PortSwigger Research ↗
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- Vulnerabilities & Patching
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