Is CVE-2026-86550 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-86550?

CVE-2026-86550 has a CVSS v3 severity of MEDIUM (6.5).

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CVE-2026-86550

Description

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.