EUVD-2026-72957
GHSA-4r5g-6487-f64m
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Network UXSS with cross-origin scope change (S:C, C:H/I:H); AC:H because it needs a reflected-XSS foothold plus a login-dialog-dismissal trigger, and UI:R for victim interaction.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
6DescriptionCVE.org
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.
AnalysisAI
Universal Cross-Site Scripting (UXSS) in UC Browser for Android (com.UCMobile.intl 13.7.8.1314) lets remote attackers run arbitrary JavaScript in the security context of any origin, defeating the same-origin policy. By luring a victim to a reflected-XSS page hosted on a UC-owned domain, an attacker abuses the browser's internal JavaScript bridge to register a deferred callback, silently navigate the tab to a target site, and fire attacker code against that origin when a login dialog is dismissed. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to be using UC Browser for Android (com.UCMobile.intl, v13.7.8.1314) and to open an attacker-supplied URL that triggers a reflected XSS on a UC-owned domain (needed to reach the privileged internal JavaScript bridge). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N, base 9.3) reflects a network-reachable, unauthenticated attack with a scope change (cross-origin compromise) and high confidentiality/integrity impact but no availability impact - consistent with a UXSS. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch version is identified at time of analysis, so treat this as unpatched pending a UCWeb advisory: update UC Browser to the latest Play Store release once the vendor confirms a fix, and verify the installed version is later than 13.7.8.1314. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Issue an immediate security alert to all users and mobile device managers advising discontinuation of UC Browser for Android and recommending immediate switching to alternative browsers such as Chrome, Safari, Firefox, or Edge. …
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External POC / Exploit Code
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