What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-28 · updated 2026-09-16
• Weakness: CWE-942

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.

Affected products

• heyform: before 3.0.0-rc.8 — fixed in 3.0.0-rc.8

How to fix

Upgrade to a fixed version: heyform 3.0.0-rc.8. Check the vendor advisory for mitigations.

References

• https://github.com/heyform/heyform
• 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/security/advisories/GHSA-fg7j-rmgr-rc9g
• https://www.vulncheck.com/advisories/heyform-reflects-any-origin-in-cors-responses-while-allowing-credentials
• https://github.com/heyform/heyform/security/advisories/GHSA-fg7j-rmgr-rc9g

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