{"id":"CVE-2026-64643","revision":null,"records":[{"revision":"5e937622318c4335a4b623e59b3e1358","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-64643","aliases":[],"title":"Next.js: Unauthenticated Disclosure of Internal Server Function endpoints","description":"Next.js is a React framework for building full-stack web applications. In versions 12.0.0 through 15.5.20 and 16.0.0 through 16.2.10, Next.js applications using App Router, Server Actions (use server) or use cache endpoints can be disclosed bypassing any authentication on the pages where these endpoints are usually used. Server Action IDs can be disclosed to unauthenticated users via publicly served client artifacts (for example, static chunks containing action references). Affected users are applications using App Router and Server Actions. By itself, this disclosure is typically a recon/enumeration primitive; however, it can increase risk when combined with other weaknesses. This issue has been fixed in versions 15.5.21 and 16.2.11.","state":0,"publishedAt":"2026-07-27T17:48:17.575+00:00","modifiedAt":"2026-07-27T18:21:55.549+00:00","affected":[{"ecosystem":"Vendor product","name":"next.js","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"vercel\",\n                    \"product\": \"next.js\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 13.0.0, < 15.5.21\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 16.0.0, < 16.2.11\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","score":6.3,"severity":"MEDIUM"}],"references":["https://github.com/vercel/next.js/security/advisories/GHSA-955p-x3mx-jcvp","https://github.com/vercel/next.js/commit/1b0c3ae912a3ad925c60065cc8d55b070fa8bcd3","https://github.com/vercel/next.js/commit/ff12a6124e1504f17b62de948b8a553fdecaef7b","https://github.com/vercel/next.js/releases/tag/v15.5.21","https://github.com/vercel/next.js/releases/tag/v16.2.11"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64643","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-64643","identifiers":["CVE-2026-64643"]},"retained":false,"historicalAffected":[]},{"revision":"c90c2a5e51864f7898fe3bcdc3145d27","observedAt":"2026-10-25T15:18:45.851+00:00","statement":{"source":"nvd","id":"CVE-2026-64643","aliases":[],"title":"Next.js is a React framework for building full-stack web applications. In versions 12.0.0 through 15.5.20 and 16.0.0 through 16.2.10, Next.js applications using App Router, Server Actions (use server) or use cache endpoints can be disclosed…","description":"Next.js is a React framework for building full-stack web applications. In versions 12.0.0 through 15.5.20 and 16.0.0 through 16.2.10, Next.js applications using App Router, Server Actions (use server) or use cache endpoints can be disclosed bypassing any authentication on the pages where these endpoints are usually used. Server Action IDs can be disclosed to unauthenticated users via publicly served client artifacts (for example, static chunks containing action references). Affected users are applications using App Router and Server Actions. By itself, this disclosure is typically a recon/enumeration primitive; however, it can increase risk when combined with other weaknesses. This issue has been fixed in versions 15.5.21 and 16.2.11.","state":0,"publishedAt":"2026-07-27T18:16:59.16+00:00","modifiedAt":"2026-10-24T13:10:00.147+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":6.3,"severity":"MEDIUM"},{"system":"CVSS 3.1 · nvd@nist.gov · Primary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","score":5.3,"severity":"MEDIUM"}],"references":["https://github.com/vercel/next.js/commit/1b0c3ae912a3ad925c60065cc8d55b070fa8bcd3","https://github.com/vercel/next.js/commit/ff12a6124e1504f17b62de948b8a553fdecaef7b","https://github.com/vercel/next.js/releases/tag/v15.5.21","https://github.com/vercel/next.js/releases/tag/v16.2.11","https://github.com/vercel/next.js/security/advisories/GHSA-955p-x3mx-jcvp"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-64643","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-201"],"productCriteria":["cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:*"],"sourceDates":{"published":"2026-07-27T18:16:59.160","lastModified":"2026-10-24T13:10:00.147"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-64643","identifiers":["CVE-2026-64643"]},"retained":false,"historicalAffected":[]},{"revision":"b01529e045af44369545818e86afc95e","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-955p-x3mx-jcvp","aliases":["CVE-2026-64643"],"title":"Next.js: Unauthenticated disclosure of internal Server Function endpoints","description":"## Impact\n\nIn Next.js applications using App Router, Server Actions (`use server`) or `use cache` endpoints can be disclosed bypassing any authentication on the pages where these endpoints are usually used.\n\nServer Action IDs can be disclosed to unauthenticated users via publicly served client artifacts (for example, static chunks containing action references).\n\nAffected users are applications using App Router + Server Actions.  \n\nBy itself, this disclosure is typically a recon/enumeration primitive; however, it can increase risk when combined with other weaknesses.\n \n## Workarounds\n\nNever assume any authentication claims at the `use cache` or `use server` boundary. Always authenticate within the boundary.","state":0,"publishedAt":"2026-07-22T23:00:34+00:00","modifiedAt":"2026-09-10T03:51:11.1989929+00:00","affected":[{"ecosystem":"npm","name":"next","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"13.0.0"},{"kind":"fixed","version":"15.5.21"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"next","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"16.0.0"},{"kind":"fixed","version":"16.2.11"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/vercel/next.js/security/advisories/GHSA-955p-x3mx-jcvp","https://github.com/vercel/next.js/commit/1b0c3ae912a3ad925c60065cc8d55b070fa8bcd3","https://github.com/vercel/next.js/commit/ff12a6124e1504f17b62de948b8a553fdecaef7b","https://github.com/vercel/next.js","https://github.com/vercel/next.js/releases/tag/v15.5.21","https://github.com/vercel/next.js/releases/tag/v16.2.11"],"sourceUrl":"https://github.com/advisories/GHSA-955p-x3mx-jcvp","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-955p-x3mx-jcvp","identifiers":["GHSA-955p-x3mx-jcvp","CVE-2026-64643"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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