Cross-site scripting vulnerability in phoenixframework phoenix_live_view allows an attacker to bypass URL scheme validation and execute JavaScript in a victim's browser session.
The Phoenix.LiveView.Utils.valid_destination!/2 and Phoenix.LiveView.Utils.valid_live_navigation_destination!/2 functions in lib/phoenix_live_view/utils.ex rely on an internal uri_scheme/1 helper that only detects a scheme when the input's first byte is an ASCII letter. Inputs beginning with an ASCII control character or space fall through to a nil-returning clause, causing the URL to be treated as a safe relative path.
Standard browsers implement the WHATWG URL parser, which strips leading C0 control and space characters before parsing. As a result, an input such as " javascript:alert(1)" is passed unchanged into <.link href={...}> and, when clicked, is parsed by the browser as a javascript: URL that executes attacker-controlled script in the victim's session.
Applications that render user-supplied URLs (for example profile links, redirect targets, or external references) via <.link href={...}> are affected.
This issue affects phoenix_live_view: from 1.2.2 before 1.2.7.
CVSS
No CVSS.
References
Configurations
No configuration.
History
13 Jul 2026, 20:16
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/phoenixframework/phoenix_live_view/security/advisories/GHSA-5cgh-g58j-m9cq - |
13 Jul 2026, 19:17
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-07-13 19:17
Updated : 2026-07-13 20:37
NVD link : CVE-2026-58228
Mitre link : CVE-2026-58228
CVE.ORG link : CVE-2026-58228
JSON object : View
Products Affected
No product.
CWE
CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')