Vulnerability · Published Jun 5, 2026 · Assigned by GitHub_M

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

High 8.7

In plain English

A high-severity cross-site scripting in haxcms-nodejs from haxtheweb. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.7High

Exploit odds (30 days)0.3%top 79.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@haxtheweb/haxcms-nodejs	26.0.0	GHSA-x3x5-7h4h-gwxg

Affected products (as reported)

Vendor	Product	Versions
haxtheweb	haxcms-nodejs	< 26.0.0
haxtheweb	haxcms-php	< 26.0.0

Weakness: CWE-79, CWE-522, CWE-922 · 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

References

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