CVE-2026-35198CWE-79cross-site-scripting

CVE-2026-35198

Critical · published July 20, 2026

CVSS v3.1
9.0
EPSS
0%
Percentile
41.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.0 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00490 · 41.2th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-07-20T20:16Z
References (4)
https://github.com/heyform/heyform/commit/cc97d27a57ae400fec23abf5dcf6f9533c3b5db3 · [email protected]https://github.com/heyform/heyform/security/advisories/GHSA-chmm-jqpm-3pwx · [email protected]https://vokecyber.com/research/cve-2026-35198-heyform-stored-xss · [email protected]https://github.com/heyform/heyform/security/advisories/GHSA-chmm-jqpm-3pwx · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 20 JUL 15:47Z
    HeyForm vulnerable to stored XSS via form field titles
    cvelistv5