CVE-2026-46391: Haxtheweb @haxtheweb/open-Apis

High severity, CVSS 8.7. EPSS: 0.5% chance of exploitation in the next 30 days.

HAX CMS helps manage microsite universe with PHP or NodeJs backends. Starting in version 9.0.1 and prior to version 26.0.0 of @haxtheweb/open-apis, multiple functions conduct substring-only matching to validate hostnames to which basic authorization should be sent. An attacker can append the matched substrings to an attacker-controlled endpoint and capture authentication. Version 26.0.0 fixes the issue.

Affected products

• Haxtheweb @haxtheweb/open-Apis: from 9.0.1, before 26.0.0 (fixed in 26.0.0)

Published 2026-06-05. Last modified 2026-06-17.