# CVE-2026-46392

## Summary

- **CVE ID:** CVE-2026-46392
- **Severity:** HIGH
- **CVSS Score:** 8.7 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N)
- **CWE:** CWE-178, CWE-434
- **Published:** Jun 5, 2026
- **Last Modified:** Jun 5, 2026

## Description

HAX CMS helps manage microsite universe with PHP or NodeJs backends. Prior to version 26.0.0 of HAX CMS PHP, the `saveFile` endpoint validates upload extensions case-insensitively and writes the filename to disk verbatim, but the `.htaccess` rule that forces `Content-Disposition: attachment` on HTML files is case-sensitive. An HTML file uploaded with an uppercase extension (`.HTML`, `.Html`, `.HTM`) is still served as `text/html` but the forced-download header never applies, so the browser renders it inline and executes any embedded JavaScript in the HAXcms origin. This bypasses the mitigation shipped for CVE-2026-22704. Version 26.0.0 contains a fix.

## Affected Products

- haxtheweb — haxcms-php (< 26.0.0)

## References

- [CNA](https://github.com/haxtheweb/issues/security/advisories/GHSA-hg33-w4j2-95qp)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.22%
- **EPSS Percentile:** 12.9

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._