CVE-2026-46392

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.

CVSS v3 8.7 HIGH

8.7^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.3 / Impact : 5.8

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/haxtheweb/issues/security/advisories/GHSA-hg33-w4j2-95qp
https://github.com/haxtheweb/issues/security/advisories/GHSA-hg33-w4j2-95qp

Configurations

No configuration.

History

No history.

Information

Published : 2026-06-05 19:16

Updated : 2026-06-17 10:53

NVD link : CVE-2026-46392

Mitre link : CVE-2026-46392

CVE.ORG link : CVE-2026-46392

JSON object : View

Products Affected

No product.

CWE

CWE-178

Improper Handling of Case Sensitivity

CWE-434

Unrestricted Upload of File with Dangerous Type

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