GHSA-fvx2-x7ff-fc56
MEDIUMUnauthenticated Disclosure of PSU HAX CMS Site Listings via haxPsuUsage API Endpoint
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
Blast Radius
@haxtheweb/open-apisReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects npm packages — download data is not available via public APIs for these ecosystems.
Description
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 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:
- Open a terminal or browser.
- Send a GET request to the following endpoint:
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 PSU domain. This alone represents an information disclosure vulnerability.
When chained with the Lack Of Authorization Checks CVE, which involves missing authorization checks on key API endpoints, the risk escalates significantly. An authenticated attacker can:
- Modify or delete other users' sites via:
createNode(),saveNode(),deleteNode()
- Access sensitive metadata or credentials:
getConfig(),downloadSite()
- Clone or remove entire sites:
cloneSite(),deleteSite(),archiveSite()
Combined, these issues allow a low-privileged user to fully compromise any site in the PSU HAX CMS instance.
This vulnerability chain puts content integrity, availability, and confidentiality at risk for potentially hundreds of PSU academic, instructional, and departmental sites.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | @haxtheweb/open-apis | all versions | No fix |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @haxtheweb/open-apis. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Remediation status
No patched version of @haxtheweb/open-apis has shipped for GHSA-fvx2-x7ff-fc56 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.
Mitigate without a patch
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-fvx2-x7ff-fc56 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-fvx2-x7ff-fc56. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-fvx2-x7ff-fc56 in your dependencies?
O3 detects GHSA-fvx2-x7ff-fc56 across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.