What’s Vulnerable › Vulnerabilities

CVE-2026-46511: HAXcms: Mass Token Exfiltration and Cross-Tenant Hijack

• Severity: high (CVSS 8.7 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-05 · updated 2026-06-17
• Weakness: CWE-79

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.

Affected products

• haxtheweb haxcms-nodejs: before 26.0.0
• haxtheweb haxcms-php: before 26.0.0

References

• https://github.com/haxtheweb/issues/security/advisories/GHSA-x3x5-7h4h-gwxg
• https://github.com/haxtheweb/issues/security/advisories/GHSA-x3x5-7h4h-gwxg

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