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CVE-2026-45797— HeyForm Vulnerable to Stored XSS via Unauthenticated SVG File Upload

Quick assessment

Affected

heyform heyform

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

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之前版本存在安全漏洞，该漏洞源于/api/upload端点允许未经验证的文件上传包括SVG文件，且上传的SVG被存储在静态资源目录并以'Content-Type: image/svg+xml'提供，可能导致攻击者实现存储型跨站脚本攻击。

AI Predicted 9.1 Difficulty: Easy EPSS 0.57% · P47 Updated Jul 21, 2026

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

Vendor	Product	Version Range	Status
heyform	heyform	`< 3.0.0-rc.7`	affected

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I. Basic Information for CVE-2026-45797

Vulnerability Information

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Vulnerability Title

HeyForm Vulnerable to Stored XSS via Unauthenticated SVG File Upload

Source: CVE Program / CVE List V5

Vulnerability Description

HeyForm is an open-source form builder. Prior to version 3.0.0-rc.7, the `/api/upload` endpoint allows unauthenticated file uploads including SVG files. Uploaded SVGs are stored in the static assets directory and served with `Content-Type: image/svg+xml` by Express's serve-static middleware, allowing an attacker to achieve stored cross-site scripting (XSS) on the heyform domain without any authentication. Version 3.0.0-rc.7 contains a patch for the issue.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

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 任意文件上传漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

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-2026-45797

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-45797

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Patches & Fixes for CVE-2026-45797 (1)

🔗 fix: block svg uploads · heyform/heyform@144240e · GitHub Read full article x_refsource_MISC

Vendor Advisories for CVE-2026-45797 (1)

🔗 Stored XSS via Unauthenticated SVG File Upload · Advisory · heyform/heyform · GitHub Read full article x_refsource_CONFIRM

https://www.cve.org/CVERecord?id=CVE-2026-45797

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

CVE-2026-35198	9.0 CRITICAL	HeyForm vulnerable to stored XSS via form field titles
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

IV. Related Vulnerabilities

Same product: heyform

Same vendor: heyform

Same weakness: CWE-79