Vulnerability · Published May 29, 2026 · Assigned by GitHub_M

CVE-2026-48527HaxCMS has a stored Cross-Site Scripting (XSS) bypass in saveNode endpoint

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 0.2% (higher than 14% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.7High

Exploit odds (30 days)0.2%top 86.4% 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. Versions up to and including 26.0.0 are affected by a stored cross-site scripting (XSS) vulnerability in the `/system/api/saveNode` endpoint. An authenticated user with a permission to edit pages can bypass the HTML sanitizer by injecting an event handler attribute without whitespace before the attribute name. @haxtheweb/haxcms-nodejs 26.0.1 and haxcms-php 26.0.2 patch the issue.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@haxtheweb/haxcms-nodejs	26.0.1	GHSA-g2g8-95qg-v35h

Affected products (as reported)

Vendor	Product	Versions
haxtheweb	haxcms-nodejs	< 26.0.1
haxtheweb	haxcms-php	< 26.0.2

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

References

https://github.com/haxtheweb/issues/security/advisories/GHSA-g2g8-95qg-v35h x_refsource_CONFIRM