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.
References6
- github.com/heyform/heyform
- github.com/heyform/heyform/blob/v3.0.0-rc.7/packages/server/src…
- github.com/heyform/heyform/commit/bf9d738ca70ae5641c0c7372982b0…
- github.com/heyform/heyform/security/advisories/GHSA-fg7j-rmgr-r…
- www.vulncheck.com/advisories/heyform-reflects-any-origin-in-cor…
- github.com/heyform/heyform/security/advisories/GHSA-fg7j-rmgr-r…
Metrics
- CVSS 3.1
-
8.1
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N - EPSS — exploit probability
- 1% percentile: 46 · as of 8 November 2026
- CWE
- CWE-942
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.