CVE-2026-35198

9.0 criticalEPSS 0.5%

Critical (9.0). EPSS 0.5% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

9.0 critical

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

EPSS: 0.5% chance of exploitation in the next 30 days; higher than 42% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2026-07-20
Modified: 2026-08-21
Record from: the NVD, synced 2026-10-19

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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