{"api_version":"1","generated_at":"2026-05-13T21:18:52+00:00","cve":"CVE-2021-39178","urls":{"html":"https://cve.report/CVE-2021-39178","api":"https://cve.report/api/cve/CVE-2021-39178.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-39178","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-39178"},"summary":{"title":"CVE-2021-39178","description":"Next.js is a React framework. Versions of Next.js between 10.0.0 and 11.0.0 contain a cross-site scripting vulnerability. In order for an instance to be affected by the vulnerability, the `next.config.js` file must have `images.domains` array assigned and the image host assigned in `images.domains` must allow user-provided SVG. If the `next.config.js` file has `images.loader` assigned to something other than default or the instance is deployed on Vercel, the instance is not affected by the vulnerability. The vulnerability is patched in Next.js version 11.1.1.","state":"PUBLIC","assigner":"security-advisories@github.com","published_at":"2021-08-31 00:15:00","updated_at":"2021-09-08 13:26:00"},"problem_types":["CWE-79"],"metrics":[],"references":[{"url":"https://github.com/vercel/next.js/security/advisories/GHSA-9gr3-7897-pp7m","name":"https://github.com/vercel/next.js/security/advisories/GHSA-9gr3-7897-pp7m","refsource":"CONFIRM","tags":[],"title":"XSS in Image Optimization API for Next.js versions between 10.0.0 and 11.1.0 · Advisory · vercel/next.js · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://github.com/vercel/next.js/releases/tag/v11.1.1","name":"https://github.com/vercel/next.js/releases/tag/v11.1.1","refsource":"MISC","tags":[],"title":"Release v11.1.1 · vercel/next.js · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-39178","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-39178","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2021","cve_id":"39178","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"vercel","cpe5":"next.js","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"node.js","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[{"cve":"CVE-2021-39178","qid":"981298","title":"Nodejs (npm) Security Update for next (GHSA-9gr3-7897-pp7m)"}]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"security-advisories@github.com","ID":"CVE-2021-39178","STATE":"PUBLIC","TITLE":"XSS in Image Optimization API for Next.js versions between 10.0.0 and 11.1.0"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"next.js","version":{"version_data":[{"version_value":">= 10.0.0, < 11.1.1"}]}}]},"vendor_name":"vercel"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"Next.js is a React framework. Versions of Next.js between 10.0.0 and 11.0.0 contain a cross-site scripting vulnerability. In order for an instance to be affected by the vulnerability, the `next.config.js` file must have `images.domains` array assigned and the image host assigned in `images.domains` must allow user-provided SVG. If the `next.config.js` file has `images.loader` assigned to something other than default or the instance is deployed on Vercel, the instance is not affected by the vulnerability. The vulnerability is patched in Next.js version 11.1.1."}]},"impact":{"cvss":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"}]}]},"references":{"reference_data":[{"name":"https://github.com/vercel/next.js/security/advisories/GHSA-9gr3-7897-pp7m","refsource":"CONFIRM","url":"https://github.com/vercel/next.js/security/advisories/GHSA-9gr3-7897-pp7m"},{"name":"https://github.com/vercel/next.js/releases/tag/v11.1.1","refsource":"MISC","url":"https://github.com/vercel/next.js/releases/tag/v11.1.1"}]},"source":{"advisory":"GHSA-9gr3-7897-pp7m","discovery":"UNKNOWN"}},"nvd":{"publishedDate":"2021-08-31 00:15:00","lastModifiedDate":"2021-09-08 13:26:00","problem_types":["CWE-79"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"CHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE","baseScore":6.1,"baseSeverity":"MEDIUM"},"exploitabilityScore":2.8,"impactScore":2.7},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:M/Au:N/C:N/I:P/A:N","accessVector":"NETWORK","accessComplexity":"MEDIUM","authentication":"NONE","confidentialityImpact":"NONE","integrityImpact":"PARTIAL","availabilityImpact":"NONE","baseScore":4.3},"severity":"MEDIUM","exploitabilityScore":8.6,"impactScore":2.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":true}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:*","versionStartIncluding":"10.0.0","versionEndExcluding":"11.1.1","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"39178","Ordinal":"214831","Title":"CVE-2021-39178","CVE":"CVE-2021-39178","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"39178","Ordinal":"1","NoteData":"Next.js is a React framework. Versions of Next.js between 10.0.0 and 11.0.0 contain a cross-site scripting vulnerability. In order for an instance to be affected by the vulnerability, the `next.config.js` file must have `images.domains` array assigned and the image host assigned in `images.domains` must allow user-provided SVG. If the `next.config.js` file has `images.loader` assigned to something other than default or the instance is deployed on Vercel, the instance is not affected by the vulnerability. The vulnerability is patched in Next.js version 11.1.1.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"39178","Ordinal":"2","NoteData":"2021-08-30","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"39178","Ordinal":"3","NoteData":"2021-08-30","Type":"Other","Title":"Modified"}]}}}