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Vulnerability record · CVE-2026-78997 · published 8 September 2026

CVE-2026-78997: Cross-site scripting vulnerability

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.

9.3 CVSS 3.1 Critical EPSS 0.40% · top 68.5% CWE-79 · Cross-site scripting Deferred
9.3CVSS 3.1 base score
0.40%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
9 Sep 2026Last modified by 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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

References

LinkTags
https://gist.github.com/OmriInbar-Novee/9fd65fe08c1b1cff6a19350e44425de2
https://gist.github.com/OmriInbar-Novee/ef7a92db148b2eb1ab0aa7b99a565c4c
https://gist.github.com/OmriInbar-Novee/9fd65fe08c1b1cff6a19350e44425de2

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Source: NIST National Vulnerability Database (record CVE-2026-78997), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.