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EUVD-2026-243683

fkie_cve-2025-49139

HAX CMS PHP allows users to manage their microsite universe with a PHP backend. Prior to version 11.0.0, in the HAX site editor, users can create a website block to load another site in an iframe. The application allows users to supply a target URL in the website block. When the HAX site is visited, the client's browser will query the supplied URL. An authenticated attacker can create a HAX site with a website block pointing at an attacker-controlled server running Responder or a similar tool. The attacker can then conduct a phishing attack by convincing another user to visit their malicious HAX site to harvest credentials. Version 11.0.0 contains a patch for the issue.

GHSA-v3ph-2q5q-cg88 — @haxtheweb/haxcms-nodejs Iframe Phishing vulnerability

Affected: npm: @haxtheweb/haxcms-nodejs

### Summary

In the HAX site editor, users can create a website block to load another site in an iframe. The application allows users to supply a target URL in the website block. When the HAX site is visited, the client's browser will query the supplied URL.

### Affected Resources

- [Operations.php:868](https://github.com/haxtheweb/haxcms-php/blob/master/system/backend/php/lib/Operations.php#L868) - `https://<site>/<user>/system/api/saveNode`

### PoC

1. Set the URL in an iframe pointing to an attacker-controlled server running Responder

![image](https://github.com/user-attachments/assets/baac23ec-7b1e-49cf-864d-c3550b2c71bf)

2. Once another user visits the site, they are prompted to sign in.

![image](https://github.com/user-attachments/assets/a3a0b75d-e12f-49cf-8669-9686353a92e2)

3. If a user inputs credentials, the username and password hash are outputted in Responder.

![image](https://github.com/user-attachments/assets/428542d3-8cf5-4bfa-b759-e630c3ee6ac3)

### Impact

An authenticated attacker can create a HAX site with a website block pointing at an attacker-controlled server running Responder or a similar tool. The attacker can then conduct a phishing attack by convincing another user to visit their malicious HAX site to harvest credentials.