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

Quick assessment

Affected
heyform heyform
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

HeyForm HeyForm是HeyForm公司的一款表单构建软件。 HeyForm 3.0.0-rc.7之前版本存在跨站脚本漏洞，该漏洞源于表单构建器存在存储型跨站脚本漏洞，允许低权限团队成员注入恶意JavaScript代码，当团队所有者查看表单时执行，导致通过权限提升实现账户接管。

CVSS 9.0 · Critical EPSS 0.49% · P41

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
heyform heyform < 3.0.0-rc.7 affected
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I. Basic Information for CVE-2026-35198

Vulnerability Information
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Vulnerability Title
HeyForm vulnerable to stored XSS via form field titles
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
HeyForm 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
HeyForm HeyForm是HeyForm公司的一款表单构建软件。 HeyForm 3.0.0-rc.7之前版本存在跨站脚本漏洞，该漏洞源于表单构建器存在存储型跨站脚本漏洞，允许低权限团队成员注入恶意JavaScript代码，当团队所有者查看表单时执行，导致通过权限提升实现账户接管。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
heyform heyform < 3.0.0-rc.7 -

II. Public POCs for CVE-2026-35198

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6297 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-35198

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Patches & Fixes for CVE-2026-35198 (1)

Vendor Advisories for CVE-2026-35198 (1)

Security Blog Posts for CVE-2026-35198 (1)

Same Patch Batch · heyform · 2026-07-20 · 4 CVEs total

CVE-2026-63429 8.6 HIGH HeyForm has unauthenticated /api/upload endpoint that accepts arbitrary files with no auth
CVE-2026-63428 5.8 MEDIUM HeyForm: completeSubmission persists submitter-supplied hidden fields verbatim without val
CVE-2026-45797 HeyForm Vulnerable to Stored XSS via Unauthenticated SVG File Upload

IV. Related Vulnerabilities

Same product: heyform
Same vendor: heyform
Same weakness: CWE-79