Unauthenticated Disclosure of PSU HAX CMS Site Listings via haxPsuUsage API Endpoint
Date: 2025-06
Affected: npm/@haxtheweb/open-apis
Attack vector: info-disclosure
Category: vulnerability-disclosure
Severity: Medium
CVE: CVE-2025-48996
CWE: CWE-201
CVSS: 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)

### Summary An **unauthenticated information disclosure vulnerability** exists in the PSU deployment of HAX CMS via the `haxPsuUsage` API endpoint. This allows **any remote unauthenticated user** to retrieve a full list of PSU websites hosted on HAX CMS. When chained with other authorization issues (e.g., HAX-3), this could assist in targeted attacks such as unauthorized content modification or deletion. --- ### Details The endpoint [`https://open-apis.hax.cloud/api/services/stats/haxPsuUsage`](https://open-apis.hax.cloud/api/services/stats/haxPsuUsage) returns a list of websites on the PSU instance of HAX CMS. This endpoint is exposed without any authentication or authorization checks. The source of the issue is in the `haxPsuUsage.js` file, which appears to directly serve the site listing without verifying user identity or access level. This enables anyone with the endpoint URL to enumerate all site instances under the PSU deployment. This endpoint may have originally been used for internal or statistical purposes but is now publicly accessible, representing a privacy and enumeration risk. --- ### PoC To reproduce this vulnerability: 1. Open a terminal or browser. 2. Send a GET request to the following endpoint: ```bash curl https://open-apis.hax.cloud/api/services/stats/haxPsuUsage --- ### Impact The `haxPsuUsage` endpoint exposes a full list of PSU HAX CMS websites to **any unauthenticated user**, allowing external actors to enumerate all sites under the P


Mitigations:

Architectural layers (MAESTRO):