CVE-2026-79315: x-ui reflected cross-site scripting in sidebar menu

CVE-2026-79315 · Severity: medium · CVSS 4.7 · Published 2026-09-22

x-ui is a web-based management panel for proxy services that allows administrators to configure and monitor Xray proxy instances. The management interface unsafely reflects request URIs into client-side template expressions in the sidebar menu. A logged-in administrator visiting a crafted link could have arbitrary JavaScript executed in their browser session, allowing attackers to steal session data, modify proxy configurations, or abuse the administrator's permissions without their knowledge.

Technologies: Vaxilu X-Ui. Vendors: Vaxilu.

Quick answers

Is CVE-2026-79315 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-79315 being exploited in the wild.
How severe is CVE-2026-79315?
Medium severity, with a CVSS score of 4.7, published 22 September 2026.
Which products and versions are affected?
Vaxilu X-Ui 0.3.2.
Is there a fix for CVE-2026-79315?
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-2026-79315 attacked?
It is attacked over the network, in a web application.
Am I affected by CVE-2026-79315?
Check whether you run Vaxilu X-Ui at an affected version. 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 reflected XSS (CWE-79) caused by improper output encoding: the server applies only HTML entity escaping to the request URI before inserting it into a client-side framework binding expression. The browser decodes entities before the framework evaluates the content as JavaScript, allowing unescaped script execution. Exploitation requires a logged-in user to visit an attacker-controlled URL, enabling data theft and unauthorized actions within the panel's same-origin context.

Affected products

  • vaxilu x-ui 0.3.2

Timeline

  • 2026-09-22: disclosed: Public disclosure via NVD
  • 2026-08-04: other: Advisory report date

References

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