CVE-2026-46511

HAXcms: Mass Token Exfiltration and Cross-Tenant Hijack

Published Jun 5, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Description
HAX CMS helps manage microsite universe with PHP or NodeJs backends. Prior to version 26.0.0, an attack chain utilizing Stored XSS alongside dynamic token exposure in the `/system/api/connectionSettings` endpoint allows an authenticated attacker to perform a complete cross-tenant account takeover. The API dynamically leaks the active session's authentication tokens (including the `jwt`, `user_token`, `site_token`, and `appstore_token`) into a global JavaScript variable (`window.appSettings`). An attacker can exploit the XSS vulnerability to force a victim's browser to silently fetch their specific connection settings, extract the tokens, and exfiltrate them to an attacker-controlled webhook. Version 26.0.0 patches the issue.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-x3x5-7h4h-gwxg HAXcms: Mass Token Exfiltration and Cross-Tenant Hijack
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Haxtheweb
Haxtheweb haxcms-nodejs
Haxtheweb haxcms-php
Vendors & Products Haxtheweb
Haxtheweb haxcms-nodejs
Haxtheweb haxcms-php
Type Values Removed Values Added
Description HAX CMS helps manage microsite universe with PHP or NodeJs backends. Prior to version 26.0.0, an attack chain utilizing Stored XSS alongside dynamic token exposure in the `/system/api/connectionSettings` endpoint allows an authenticated attacker to perform a complete cross-tenant account takeover. The API dynamically leaks the active session's authentication tokens (including the `jwt`, `user_token`, `site_token`, and `appstore_token`) into a global JavaScript variable (`window.appSettings`). An attacker can exploit the XSS vulnerability to force a victim's browser to silently fetch their specific connection settings, extract the tokens, and exfiltrate them to an attacker-controlled webhook. Version 26.0.0 patches the issue.
Title HAXcms: Mass Token Exfiltration and Cross-Tenant Hijack
Weaknesses CWE-522
CWE-79
CWE-922
References
Metrics cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Jun 8, 2026, 3:55 PM
Reserved
May 14, 2026, 7:12 PM
Status
Deferred
Published
Jun 5, 2026, 7:16 PM
Modified
Jun 17, 2026, 10:53 AM