CVE-2026-63428

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Source
https://cve.org/CVERecord?id=CVE-2026-63428
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63428.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-63428
Aliases
  • GHSA-r7vg-xh87-v4w3
Published
2026-07-20T15:50:14.065Z
Modified
2026-07-21T03:47:28.677293533Z
Severity
  • 5.8 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N CVSS Calculator
Summary
HeyForm: completeSubmission persists submitter-supplied hidden fields verbatim without validating against the form's declared hidden-field set
Details

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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63428.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-20",
        "CWE-915"
    ]
}
References

Affected packages

Git / github.com/heyform/heyform

Affected ranges

Type
GIT
Repo
https://github.com/heyform/heyform
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
84d8c9993ae1c89b9a9e4793dac4331a26b12ba3
Database specific 
{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "3.0.0-rc.9"
        }
    ]
}

Affected versions

v0.*
v0.0.1
v0.0.10
v0.0.11
v0.0.12
v0.0.13
v0.0.15
v0.0.16
v0.0.17
v0.0.2
v0.0.3
v0.0.4
v0.0.5
v0.0.6
v0.0.7
v0.0.8
v0.0.9
v0.1.0
v3.*
v3.0.0-alpha-2
v3.0.0-alpha.3
v3.0.0-rc.1
v3.0.0-rc.2
v3.0.0-rc.3
v3.0.0-rc.4
v3.0.0-rc.5
v3.0.0-rc.6
v3.0.0-rc.7
v3.0.0-rc.8

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63428.json"