CVE-2026-86550 UXSS vulnerability in ZTE browser products
Attackers can execute arbitrary JavaScript in any website's origin via a UXSS flaw in the ZTE NebulaOS browser, compromising user sessions and data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-86550?
CVE-2026-86550 is a medium-severity cross-site scripting vulnerability in ZTE NebulaOS, published on 8 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-86550?
How do I fix CVE-2026-86550?
No fix has been published for CVE-2026-86550 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-86550 being exploited?
There is no known exploitation of CVE-2026-86550 in the wild and no public exploit code.
Sources
Also known as GHSA-5xg9-xgmv-w59x.