{"id":"CVE-2026-45797","state":"PUBLISHED","title":"HeyForm Vulnerable to Stored XSS via Unauthenticated SVG File Upload","description":"HeyForm is an open-source form builder. Prior to version 3.0.0-rc.7, the `/api/upload` endpoint allows unauthenticated file uploads including SVG files. Uploaded SVGs are stored in the static assets directory and served with `Content-Type: image/svg+xml` by Express's serve-static middleware, allowing an attacker to achieve stored cross-site scripting (XSS) on the heyform domain without any authentication. Version 3.0.0-rc.7 contains a patch for the issue.","publishedAt":"2026-07-20T15:43:13.473Z","updatedAt":"2026-07-20T19:07:52.276Z","severity":{"score":6.4,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["heyform heyform"],"affected":[{"vendor":"heyform","product":"heyform","versions":[{"version":"< 3.0.0-rc.7","status":"affected"}]}],"references":["https://github.com/heyform/heyform/security/advisories/GHSA-m94h-jxvc-hhch","https://github.com/heyform/heyform/commit/144240e5545d10fd9e120d05ccb402a6d7064674"],"weaknesses":["CWE-79","CWE-434"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/45xxx/CVE-2026-45797.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-45797","state":"PUBLISHED","datePublished":"2026-07-20T15:43:13.473Z","dateUpdated":"2026-07-20T19:07:52.276Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-05-13T08:19:32.603Z"},"containers":{"cna":{"title":"HeyForm Vulnerable to Stored XSS via Unauthenticated SVG File Upload","descriptions":[{"lang":"en","value":"HeyForm is an open-source form builder. Prior to version 3.0.0-rc.7, the `/api/upload` endpoint allows unauthenticated file uploads including SVG files. Uploaded SVGs are stored in the static assets directory and served with `Content-Type: image/svg+xml` by Express's serve-static middleware, allowing an attacker to achieve stored cross-site scripting (XSS) on the heyform domain without any authentication. Version 3.0.0-rc.7 contains a patch for the issue."}],"affected":[{"vendor":"heyform","product":"heyform","versions":[{"version":"< 3.0.0-rc.7","status":"affected"}]}],"references":[{"url":"https://github.com/heyform/heyform/security/advisories/GHSA-m94h-jxvc-hhch","name":"https://github.com/heyform/heyform/security/advisories/GHSA-m94h-jxvc-hhch","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/heyform/heyform/commit/144240e5545d10fd9e120d05ccb402a6d7064674","name":"https://github.com/heyform/heyform/commit/144240e5545d10fd9e120d05ccb402a6d7064674","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"PASSIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","subAvailabilityImpact":"NONE","baseScore":6.4,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","lang":"en","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","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":"2026-07-20T15:43:13.473Z"},"source":{"advisory":"GHSA-m94h-jxvc-hhch","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-20T19:01:36.295474Z","id":"CVE-2026-45797","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-20T19:07:52.276Z"}}]}}}