VulnSocial

CVE-2026-78997Disclosure

LOWCVSS 9.3 · CRITICAL

Exploit discussion active in current signal (1 latest mentions)

Immediate actions

  • Hunt for exploitation attempts and persistence artifacts
  • Increase monitoring for publicly documented tradecraft
  • Track advisory updates for patch or workaround availability

Recommended action window: High priority (within 72h)

NVD description

UC Browser for Android (package com.UCMobile.intl, version 13.7.8.1314) contains a Universal Cross-Site Scripting vulnerability that allows an attacker to execute arbitrary JavaScript in the context of any origin. An attacker hosts a specially crafted URL on a UC-owned domain (via a reflected XSS) that leverages the browser's internal JavaScript bridge to register a deferred callback, navigate the tab to a victim site, and then execute attacker-controlled code on that site when a login dialog is dismissed.

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1.5/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-79

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

NONE

Momentum

NONE

Threat summary

  • Public PoC is present in monitored signal
  • 1 mentions across 1 observed day

What's happening

  • PoC mentioned or linked in 1 signal
  • Technical details provided in 1 signal
  • Disclosure: 1 classified signal
  • 1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-09-11: 1PoC Mentioned / Linked · 2026-09-11: 1Technical Details · 2026-09-11: 109-11
Signal classification1 categories
Disclosure
1100.0%
Referenced assets2 URLs
Full discourse1 post
  • Hunt-Benito@HB_CyberSec
    Disclosure

    CVE-2026-78997: 9.3 Critical UXSS in UC Browser for Android. A login-dialog callback outlives page navigation - its URL guard is empty, so it fires on ANY origin. One tap = your JS on https://google.com. No fix yet. https://hunt-benito.com/blog/the-callback-that-outlived-the-page-cve-2026-78997-universal-xss-in-uc-browser-for-android/ #Android #XSS #CyberSecurity https://t.co/POmU8PIqFN

    Post summary

    The tweet announces a critical universal XSS (UXSS) flaw in UC Browser for Android, describing the technical details and linking to a blog containing the PoC, with no patch available yet.

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    6 followersView on X

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