CVE-2026-78997
48Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 9.3epss 0.3%
from disclosure to weapon3 days
Published on NVDSep 8
1st PoC+3d
exploitation probability
0.3%top 80% of all CVEs
observed exploitation
nono source reports it
1 public exploit(s)
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
Affected products
n/a · n/apublic PoCs found — 1
githubgithub.com/Hunt-Benito/the-callback-that-outlived-the-page-cve-2026-78997-uc-browser-android-universal-xss★ 0⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.