What’s Vulnerable › Vulnerabilities

CVE-2026-35198: HeyForm vulnerable to stored XSS via form field titles

• Severity: critical (CVSS 9.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-20 · updated 2026-08-21
• Weakness: CWE-79

Description

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.

Affected products

• heyform: before 3.0.0-rc.7

References

• https://github.com/heyform/heyform/commit/cc97d27a57ae400fec23abf5dcf6f9533c3b5db3
• https://github.com/heyform/heyform/security/advisories/GHSA-chmm-jqpm-3pwx
• https://vokecyber.com/research/cve-2026-35198-heyform-stored-xss
• https://github.com/heyform/heyform/security/advisories/GHSA-chmm-jqpm-3pwx

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