CVEvulnerability

CVE-2026-63428

5.8 MEDIUM Published 2026-07-20 Modified 2026-07-22 Official page ↗
Status
Deferred
Published
2026-07-20
Last modified
2026-07-22
Assigner
[email protected]
CVSS 3.1 ([email protected])
5.8 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Weaknesses
CWE-20, CWE-915

Description

HeyForm is an open-source form builder. Prior to version 3.0.0-rc.9, `completeSubmission` accepts a `hiddenFields: [{id, name, value}]` array from the submitter and stores it verbatim in `submission.hiddenFields`, without validating the supplied `id`/`name` against the form's declared `form.hiddenFields` schema. An anonymous form submitter can therefore inject arbitrary key/value pairs (including XSS payloads, fake authorization metadata, integration-relevant values) into the stored submission. These fields are subsequently forwarded as-is to every webhook integration registered on the form. Version 3.0.0-rc.9 contains a patch for the issue.

Related

Weakness · CWE (2)

  • CWE-20 Improper Input Validation weakness
  • CWE-915 Improperly Controlled Modification of Dynamically-Determined Object Attributes weakness

References