Quick answers
- Is CVE-2026-86550 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-86550 being exploited in the wild.
- How severe is CVE-2026-86550?
- Medium severity, with a CVSS score of 6.5, published 8 September 2026.
- Which products and versions are affected?
- ZTE NuBrowser.
- Is there a fix for CVE-2026-86550?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-86550 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-86550?
- Check whether you run Zte NuBrowser. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is a universal cross-site scripting (UXSS) flaw in NuBrowser's handling of intent:// protocol URLs. The browser fails to properly validate the S.browser_fallback_url parameter, which is intended to specify a safe fallback target if an app is not installed. An attacker can craft a 302 HTTP redirect containing a javascript: URL in this field, bypassing the protocol whitelist. When processed, this allows arbitrary JavaScript execution within the origin of any website, not just the attacker's own site. The vulnerability is remotely exploitable via a crafted web page or malicious redirect and requires no user authentication or special privileges beyond visiting a malicious URL.
Affected products
- ZTE NuBrowser
Timeline
- 2026-09-08: disclosed
- 2026-09-08: advisory