UXSS vulnerability in ZTE browser products

published 2026-09-08 2mo ago modified 2026-09-09 2mo ago also EUVD-2026-72670

cvss: 6.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 40%
public exploits: 0; none known

NuBrowser lacks protocol whitelist validation for the S.browser_fallback_url field of intent://, allowing attackers to inject javascript: URLs via 302 redirects. This results in a universal cross‑site scripting (UXSS) vulnerability that enables script execution within the origin of arbitrary websites.

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CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 2mo ago (2026-09-08)

Exploit prediction

0.46% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Affected products

ZTE NebulaOS

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

support.zte.com.cn /zte-iccp-isupport-webui/bulletin/detail/874505866159006721

Sources

CVE List CVE-2026-86550
NVD CVE-2026-86550

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