phoenixframework phoenix_live_view up to 1.2.6 URL Scheme Validator utils.ex valid_destination!/2 cross site scripting

Summaryinfo

A vulnerability was found in phoenixframework phoenix_live_view up to 1.2.6. It has been rated as problematic. Affected by this vulnerability is the function valid_destination!/2 of the file lib/phoenix_live_view/utils.ex of the component URL Scheme Validator. Performing a manipulation of the argument URL results in cross site scripting. This vulnerability is reported as CVE-2026-58228. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as problematic, was found in phoenixframework phoenix_live_view up to 1.2.6. This affects the function valid_destination!/2 of the file lib/phoenix_live_view/utils.ex of the component URL Scheme Validator. The manipulation of the argument URL with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-58228 since 06/29/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

Upgrading to version 1.2.7 eliminates this vulnerability.

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Productinfo

Vendor

• phoenixframework

Name

• phoenix_live_view

Version

• 1.2.0
• 1.2.1
• 1.2.2
• 1.2.3
• 1.2.4
• 1.2.5
• 1.2.6

Website

• Product: https://github.com/phoenixframework/phoenix_live_view/

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