by Kastro
Paper/Archive/CVE-2026-35198

CVE-2026-35198

heyform heyform — HeyForm vulnerable to stored XSS via form field titles

EPSS 0.5%public exploitCVSS 9.0
critical.is priorityof 100
45
CVSS 9.0 (CNA)9.0 / 10 × 3027.0Not in CISA KEV+300.0EPSS percentile 42.1.421 × 208.4Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
heyform< 3.0.0-rc.7–CNA

Scores by source

GitHub_M (CNA)9.0CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: poc · Automatable: no · Technical impact: total

References

exploitgithub.com/heyform/heyform/security/advisories/GHSA-chmm-jqpm-3pwxrefgithub.com/heyform/heyform/commit/cc97d27a57ae400fec23abf5dcf6f9533c3b5db3refvokecyber.com/research/cve-2026-35198-heyform-stored-xss