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EUVD-2026-67822 · Published Aug 28, 2026
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.
Weaknesses
CWE-942
CVSS scores
- v3.18.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
MITRE ATT&CK
InferredWhere this vulnerability fits in an attack
Initial Access
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
Potentially impacted assets
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