---
id: CVE-2026-82291
title: >-
  HeyForm before 3.0.0-rc.8 reflects the request Origin header in CORS responses
  while allowing credentials, enabling cross-origin requests with authentication
summary: >-
  HeyForm before 3.0.0-rc.8 reflects the request Origin header in CORS responses
  while allowing credentials, enabling cross-origin requests with
  authentication. Attackers can execute authenticated GraphQL queries from
  malicious pages visit…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N'
cwe:
  - CWE-942
published: '2026-08-28'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T13:42:44.547'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-82291'
references:
  - url: 'https://github.com/heyform/heyform'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/heyform/heyform/blob/v3.0.0-rc.7/packages/server/src/main.ts
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/heyform/heyform/commit/bf9d738ca70ae5641c0c7372982b00365c5144d4
    label: disclosure@vulncheck.com
  - url: 'https://github.com/heyform/heyform/security/advisories/GHSA-fg7j-rmgr-rc9g'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/heyform-reflects-any-origin-in-cors-responses-while-allowing-credentials
    label: disclosure@vulncheck.com
  - url: 'https://github.com/heyform/heyform/security/advisories/GHSA-fg7j-rmgr-rc9g'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00553
epssPercentile: 0.43744
ingestedAt: '2026-09-16T13:56:12.599Z'
vendor: heyform
product: heyform
affected:
  - heyform < 3.0.0-rc.8
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-08-31T18:58:33.669103Z'
---

## Overview

HeyForm before 3.0.0-rc.8 reflects the request Origin header in CORS responses while allowing credentials, enabling cross-origin requests with authentication. Attackers can execute authenticated GraphQL queries from malicious pages visited by logged-in users to access workspaces, projects, forms, submissions, and respondent data, or modify account settings.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.