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CVE-2026-63429

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-
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:ff0d3e2516e7e08efe0e2265bfaa2d2e60b589e1b3e6cd0f851fa6e5b6635931
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-434","description":"CWE-434: Unrestricted Upload of File with Dangerous Type","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8016503db4cba2bb4619dfefd6c12a73c348da2fd976d8476946fd030bc0d839 · sha256:2d13c8f7dae25c7a… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-306","description":"CWE-306: Missing Authentication for Critical Function","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8016503db4cba2bb4619dfefd6c12a73c348da2fd976d8476946fd030bc0d839 · sha256:2d13c8f7dae25c7a… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"heyform","vendor":"heyform","versions":[{"status":"affected","version":"< 3.0.0-rc.9"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8016503db4cba2bb4619dfefd6c12a73c348da2fd976d8476946fd030bc0d839 · sha256:2d13c8f7dae25c7a… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"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"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:8016503db4cba2bb4619dfefd6c12a73c348da2fd976d8476946fd030bc0d839 · sha256:2d13c8f7dae25c7a… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-434","description":"CWE-434: Unrestricted Upload of File with Dangerous Type","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8016503db4cba2bb4619dfefd6c12a73c348da2fd976d8476946fd030bc0d839 · sha256:2d13c8f7dae25c7a… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-306","description":"CWE-306: Missing Authentication for Critical Function","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8016503db4cba2bb4619dfefd6c12a73c348da2fd976d8476946fd030bc0d839 · sha256:2d13c8f7dae25c7a… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/heyform/heyform/commit/092e255e9e02565de1b3c057f3dad849160952d2","tags":["x_refsource_MISC"],"url":"https://github.com/heyform/heyform/commit/092e255e9e02565de1b3c057f3dad849160952d2"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8016503db4cba2bb4619dfefd6c12a73c348da2fd976d8476946fd030bc0d839 · sha256:2d13c8f7dae25c7a… · /containers/cna/references/1
{"tags":["exploit"],"url":"https://github.com/heyform/heyform/security/advisories/GHSA-432x-54v2-p7p7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8016503db4cba2bb4619dfefd6c12a73c348da2fd976d8476946fd030bc0d839 · sha256:2d13c8f7dae25c7a… · /containers/adp/0/references/0
{"name":"https://github.com/heyform/heyform/security/advisories/GHSA-432x-54v2-p7p7","tags":["x_refsource_CONFIRM"],"url":"https://github.com/heyform/heyform/security/advisories/GHSA-432x-54v2-p7p7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8016503db4cba2bb4619dfefd6c12a73c348da2fd976d8476946fd030bc0d839 · sha256:2d13c8f7dae25c7a… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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