CVE-2026-102615

HeyForm is an open-source form builder. Prior to 3.0.1, /api/upload accepts a file according to the client-controlled multipart file.mimetype while retaining an HTML filename, and static/upload serves the resulting file as text/html with contentSecurityPolicy: false. An ordinary user can therefore upload active HTML that executes on the HeyForm origin when a victim opens its returned URL. The same-origin script can access /graphql with the victim's session and read or modify data available to that account. The code also permits upload requests tied to an active public form through formId, openToken, and a fieldId belonging to a file or signature question, although the advisory did not fully verify that unauthenticated path end to end. This issue is fixed in version 3.0.1.

• CWE-79

• https://github.com/heyform/heyform/commit/849f7101d4370b29e716b2d7ee14a86c2f598f3a
• https://github.com/heyform/heyform/releases/tag/v3.0.1
• https://github.com/heyform/heyform/security/advisories/GHSA-pxw5-pjrc-j758

Published

Nov 5, 2026

Last Modified

Nov 5, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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