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CVE-2026-63429 is a high-severity vulnerability in HeyForm, an open-source form builder, affecting versions prior to 3.0.0-rc.9. The issue resides in the POST /api/upload endpoint, which lacks an authentication guard, global guard enforcement, form-context validation, openToken enforcement, and session cookie verification. Because the endpoint is reachable without any effective authorization or binding to a specific form submission context, any anonymous remote user can submit upload requests that are accepted by the application. Successful exploitation allows arbitrary supported files, including documents, media, and images up to 10 MB, to be uploaded and hosted with a permanent public URL on the HeyForm domain.
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No public exploit code observed for this vulnerability.
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Cross-references every affected SKU, including bundled OEM variants.
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