{"id":"CVE-2026-63429","state":"PUBLISHED","title":"HeyForm has unauthenticated /api/upload endpoint that accepts arbitrary files with no auth/session/form context","description":"HeyForm is an open-source form builder. Prior to version 3.0.0-rc.9, `POST /api/upload` has no authentication guard, no global guard, no form-context validation, no `openToken` requirement, and no session cookie check. Any anonymous internet user can upload files (PDF, DOC/DOCX, XLS/XLSX, CSV, TXT, MP4, images, etc., up to 10 MB) and receive a permanent public URL on the HeyForm domain. The endpoint is used by both authenticated form creators and unauthenticated form submitters; because no form-context binding exists, every request to it is anonymously accepted. Version 3.0.0-rc.9 contains a patch for the issue.","publishedAt":"2026-07-20T15:54:22.075Z","updatedAt":"2026-07-20T17:45:35.044Z","severity":{"score":8.6,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L","source":"GitHub_M"},"assigner":"GitHub_M","products":["heyform heyform"],"affected":[{"vendor":"heyform","product":"heyform","versions":[{"version":"< 3.0.0-rc.9","status":"affected"}]}],"references":["https://github.com/heyform/heyform/security/advisories/GHSA-432x-54v2-p7p7","https://github.com/heyform/heyform/commit/092e255e9e02565de1b3c057f3dad849160952d2"],"weaknesses":["CWE-306","CWE-434"],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/63xxx/CVE-2026-63429.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-63429","state":"PUBLISHED","datePublished":"2026-07-20T15:54:22.075Z","dateUpdated":"2026-07-20T17:45:35.044Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-07-16T19:35:57.766Z"},"containers":{"cna":{"title":"HeyForm has unauthenticated /api/upload endpoint that accepts arbitrary files with no auth/session/form context","descriptions":[{"lang":"en","value":"HeyForm is an open-source form builder. Prior to version 3.0.0-rc.9, `POST /api/upload` has no authentication guard, no global guard, no form-context validation, no `openToken` requirement, and no session cookie check. Any anonymous internet user can upload files (PDF, DOC/DOCX, XLS/XLSX, CSV, TXT, MP4, images, etc., up to 10 MB) and receive a permanent public URL on the HeyForm domain. The endpoint is used by both authenticated form creators and unauthenticated form submitters; because no form-context binding exists, every request to it is anonymously accepted. Version 3.0.0-rc.9 contains a patch for the issue."}],"affected":[{"vendor":"heyform","product":"heyform","versions":[{"version":"< 3.0.0-rc.9","status":"affected"}]}],"references":[{"url":"https://github.com/heyform/heyform/security/advisories/GHSA-432x-54v2-p7p7","name":"https://github.com/heyform/heyform/security/advisories/GHSA-432x-54v2-p7p7","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/heyform/heyform/commit/092e255e9e02565de1b3c057f3dad849160952d2","name":"https://github.com/heyform/heyform/commit/092e255e9e02565de1b3c057f3dad849160952d2","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":8.6,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-306","lang":"en","description":"CWE-306: Missing Authentication for Critical Function","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-434","lang":"en","description":"CWE-434: Unrestricted Upload of File with Dangerous Type","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-07-20T15:54:22.075Z"},"source":{"advisory":"GHSA-432x-54v2-p7p7","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/heyform/heyform/security/advisories/GHSA-432x-54v2-p7p7","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-20T17:45:12.280558Z","id":"CVE-2026-63429","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-20T17:45:35.044Z"}}]}}}