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UC Browser for Android version 13.7.8.1314 contains a universal cross-site scripting vulnerability involving its internal JavaScript bridge and deferred-callback handling. An attacker can use reflected cross-site scripting on a UC-controlled origin to register an attacker-controlled deferred callback, navigate the same tab to an arbitrary victim origin, and cause the callback to execute in the victim origin's security context when a login dialog is dismissed.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This four-file repository is an operational proof-of-concept package for a claimed UC Browser for Android universal XSS condition, CVE-2026-78997. Two Python programs provide the main functionality: poc_url_builder.py generates, but does not request, a crafted mtmsg.uc.cn URL containing a URL-encoded reflected script; callback_oracle.py is a dependency-free simulation of the vulnerable native callback lifecycle and its origin-binding remediation. The generated script uses the privileged ucapi account.openLoginWindow bridge API to persist callback strings in native state, navigates to a selected victim site, and relies on native login-dialog dismissal to dispatch JavaScript with an empty URL guard into the current WebView origin. frida_hooks.js is an observation-only Android Frida hook for WebView.evaluateJavascript that logs dispatched scripts and their current page URL. README.md documents setup, user interaction requirements, affected package/version, and research references. The repository contains no direct network client: URL construction is local, while the optional exfiltration payload embeds a configurable localhost collector template.
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2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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Cross-references every affected SKU, including bundled OEM variants.
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