HeyForm vulnerable to stored XSS via form field titles
Priority HIGH 74CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.
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 views the form, leading to complete account takeover through privilege escalation. Version 3.0.0-rc.7 contains a patch for the issue.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0049 42nd percentileScored 2026-11-07
Fix Fixed heyform (heyform): 3.0.0-rc.7
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
- Fix · CNA heyform (heyform) Fixed in 3.0.0-rc.7
Timeline
- 2026-10-02 Threatist record created from CVE-2026-35198
References
More heyform vulnerabilities
- TI-2026-45208 HeyForm has unauthenticated /api/upload endpoint that accepts arbitrary files with no auth/session/form context CVSS 3.1HIGH 8.6
- TI-2026-56756 HeyForm Reflects Any Origin in CORS Responses While Allowing Credentials CVSS 3.1HIGH 8.1
- TI-2026-45207 Improper input validation in heyform CVSS 3.1MEDIUM 5.8
- TI-2026-33532 HeyForm Vulnerable to Stored XSS via Unauthenticated SVG File Upload CVSS 4.0MEDIUM 6.4
- TI-2026-85482 Stored cross-site scripting in HeyForm via uploaded HTML files CVSS 3.1HIGH 7.6
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences