CVE-2026-63428

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-63428", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-07-16T19:35:57.766Z", "datePublished": "2026-07-20T15:50:14.065Z", "dateUpdated": "2026-07-20T16:13:26.732Z"}, "containers": {"cna": {"title": "HeyForm: completeSubmission persists submitter-supplied hidden fields verbatim without validating against the form's declared hidden-field set", "problemTypes": [{"descriptions": [{"cweId": "CWE-20", "lang": "en", "description": "CWE-20: Improper Input Validation", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-915", "lang": "en", "description": "CWE-915: Improperly Controlled Modification of Dynamically-Determined Object Attributes", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/heyform/heyform/security/advisories/GHSA-r7vg-xh87-v4w3", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/heyform/heyform/security/advisories/GHSA-r7vg-xh87-v4w3"}, {"name": "https://github.com/heyform/heyform/commit/092e255e9e02565de1b3c057f3dad849160952d2", "tags": ["x_refsource_MISC"], "url": "https://github.com/heyform/heyform/commit/092e255e9e02565de1b3c057f3dad849160952d2"}], "affected": [{"vendor": "heyform", "product": "heyform", "versions": [{"version": "< 3.0.0-rc.9", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-07-20T15:50:14.065Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-r7vg-xh87-v4w3", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/heyform/heyform/security/advisories/GHSA-r7vg-xh87-v4w3", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-07-20T16:11:40.127768Z", "id": "CVE-2026-63428", "options": [{"Exploitation": "poc"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-20T16:13:26.732Z"}}]}}

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{"affected": [{"affectedData": [{"product": "heyform", "vendor": "heyform", "versions": [{"status": "affected", "version": "< 3.0.0-rc.9"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-63428", "lastModified": "2026-07-22T20:50:36.493", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-63428", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-20T16:11:40.127768Z", "version": "2.0.3"}}]}, "published": "2026-07-20T16:17:06.680", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/heyform/heyform/commit/092e255e9e02565de1b3c057f3dad849160952d2"}, {"source": "security-advisories@github.com", "url": "https://github.com/heyform/heyform/security/advisories/GHSA-r7vg-xh87-v4w3"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/heyform/heyform/security/advisories/GHSA-r7vg-xh87-v4w3"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-20"}, {"lang": "en", "value": "CWE-915"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,3.0.0-rc.9)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "heyform", "source": "cna", "vendor": "heyform"}, "product": "heyform", "vendor": "heyform"}], "created": "2026-07-21T20:45:03.259604+00:00", "updated": "2026-07-30T19:15:04.771535+00:00", "vendors": ["heyform", "heyform$PRODUCT$heyform"]}