---
id: CVE-2026-35198
title: HeyForm is an open-source form builder
summary: >-
  HeyForm is an open-source form builder. Prior to version 3.0.0-rc.7, a stored
  cross-site scripting (XSS) vulnerability in the form builder allows a
  low-privileged team member to inject malicious JavaScript that executes when a
  team owner…
severity: critical
cvss: 9
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H'
cwe:
  - CWE-79
published: '2026-07-20'
updated: '2026-08-21'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-35198'
references:
  - url: >-
      https://github.com/heyform/heyform/commit/cc97d27a57ae400fec23abf5dcf6f9533c3b5db3
    label: security-advisories@github.com
  - url: 'https://github.com/heyform/heyform/security/advisories/GHSA-chmm-jqpm-3pwx'
    label: security-advisories@github.com
  - url: 'https://vokecyber.com/research/cve-2026-35198-heyform-stored-xss'
    label: security-advisories@github.com
  - url: 'https://github.com/heyform/heyform/security/advisories/GHSA-chmm-jqpm-3pwx'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.0049
epssPercentile: 0.3946
ingestedAt: '2026-08-22T13:32:35.490Z'
---

## Overview

HeyForm is an open-source form builder. Prior to version 3.0.0-rc.7, a stored cross-site scripting (XSS) vulnerability in the form builder allows a low-privileged team member to inject malicious JavaScript that executes when a team owner views the form, leading to complete account takeover through privilege escalation. Version 3.0.0-rc.7 contains a patch for the issue.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.