{"id":"CVE-2026-47684","revision":null,"records":[{"revision":"8ba5512e195d4d44b450108436ec5563","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-47684","aliases":[],"title":"Sync-in Server: SSRF protection bypass via IPv4-mapped IPv6 addresses in regExpPrivateIP","description":"Sync-in Server is a secure, open-source platform for file storage, sharing, collaboration, and syncing. Prior to version 2.3.0, the private IP blocklist regex used in the URL download feature does not match IPv4-mapped IPv6 addresses (e.g. ::ffff:127.0.0.1), allowing SSRF protection to be bypassed on dual-stack systems. Version 2.3.0 fixes the issue.","state":0,"publishedAt":"2026-06-16T14:31:30.807+00:00","modifiedAt":"2026-06-16T17:10:12.548+00:00","affected":[{"ecosystem":"Vendor product","name":"server","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Sync-in\",\n                    \"product\": \"server\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 2.3.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N","score":7.7,"severity":"HIGH"}],"references":["https://github.com/Sync-in/server/security/advisories/GHSA-q4x5-8cj6-52wg","https://github.com/Sync-in/server/releases/tag/v2.3.0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-47684","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-47684","identifiers":["CVE-2026-47684"]},"retained":false,"historicalAffected":[]},{"revision":"24516a510d3d41dd96185f745ec86a8a","observedAt":"2026-11-07T11:27:50.426+00:00","statement":{"source":"euvd","id":"EUVD-2026-37123","aliases":["CVE-2026-47684","GHSA-q4x5-8cj6-52wg"],"title":"Sync-in Server is a secure, open-source platform for file storage, sharing, collaboration, and syncing. 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Version 2.3.0 fixes the issue.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N","score":7.7,"severity":null}],"references":["https://github.com/Sync-in/server/security/advisories/GHSA-q4x5-8cj6-52wg","https://github.com/Sync-in/server/releases/tag/v2.3.0"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-37123","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Jun 16, 2026, 2:31:30 PM","dateUpdated":"Jun 16, 2026, 5:10:12 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-37123","identifiers":["EUVD-2026-37123","CVE-2026-47684","GHSA-q4x5-8cj6-52wg"]},"retained":false,"historicalAffected":[]},{"revision":"f661dc9b0b21466da3c3e94edfb6f04b","observedAt":"2026-10-27T13:11:48.565+00:00","statement":{"source":"nvd","id":"CVE-2026-47684","aliases":[],"title":"Sync-in Server is a secure, open-source platform for file storage, sharing, collaboration, and syncing. Prior to version 2.3.0, the private IP blocklist regex used in the URL download feature does not match IPv4-mapped IPv6 addresses (e.g. …","description":"Sync-in Server is a secure, open-source platform for file storage, sharing, collaboration, and syncing. Prior to version 2.3.0, the private IP blocklist regex used in the URL download feature does not match IPv4-mapped IPv6 addresses (e.g. ::ffff:127.0.0.1), allowing SSRF protection to be bypassed on dual-stack systems. Version 2.3.0 fixes the issue.","state":0,"publishedAt":"2026-06-16T15:16:41.063+00:00","modifiedAt":"2026-10-25T23:10:00.167+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N","score":7.7,"severity":"HIGH"}],"references":["https://github.com/Sync-in/server/releases/tag/v2.3.0","https://github.com/Sync-in/server/security/advisories/GHSA-q4x5-8cj6-52wg"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-47684","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-918"],"productCriteria":[],"sourceDates":{"published":"2026-06-16T15:16:41.063","lastModified":"2026-10-25T23:10:00.167"},"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-2026-47684","identifiers":["CVE-2026-47684"]},"retained":false,"historicalAffected":[]},{"revision":"613c3bac87f145eab4083ca0c74490af","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-q4x5-8cj6-52wg","aliases":["CVE-2026-47684"],"title":"Sync-in Server: SSRF protection bypass via IPv4-mapped IPv6 addresses in regExpPrivateIP","description":"Summary:\nThe private IP blocklist regex used in the URL download feature does not match IPv4-mapped IPv6 addresses (e.g. ::ffff:127.0.0.1), allowing SSRF protection to be bypassed on dual-stack systems.\n\nAffected components\n\nbackend/src/applications/files/services/files-manager.service.ts – downloadFromUrl() checks regExpPrivateIP against request.socket.remoteAddress.\nbackend/src/applications/files/utils/url-file.ts – regExpPrivateIP does not include ::ffff:<ipv4> variants.\n\nDetails:\nThe regExpPrivateIP regex in backend/src/applications/files/utils/url-file.ts correctly blocks standard IPv4 private ranges but does not include ::ffff: prefixed variants. On dual-stack systems, Node.js can report a socket's remoteAddress in IPv4-mapped IPv6 form, meaning the check in FilesManager.downloadFromUrl() can be bypassed entirely.\n\nPoC:\n[poc.pdf](https://github.com/user-attachments/files/26990874/poc.pdf)\n\n\n\n\nProof:\n<img width=\"1080\" height=\"842\" alt=\"1000226655\" src=\"https://github.com/user-attachments/assets/797cea83-0a08-4a16-a91b-31c51068d473\" />\n\n\n\n\n\nImpact:\nAn attacker can supply a crafted URL pointing to an internal address that gets reported as ::ffff:127.0.0.1 or ::ffff:10.x.x.x, causing the server to fetch internal resources that should be blocked. Any user with access to the file download feature is a potential attacker.","state":0,"publishedAt":"2026-06-05T16:34:59+00:00","modifiedAt":"2026-07-08T17:45:18.1939043+00:00","affected":[{"ecosystem":"npm","name":"@sync-in/server","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"2.3.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/Sync-in/server/security/advisories/GHSA-q4x5-8cj6-52wg","https://nvd.nist.gov/vuln/detail/CVE-2026-47684","https://github.com/Sync-in/server","https://github.com/Sync-in/server/releases/tag/v2.3.0"],"sourceUrl":"https://github.com/advisories/GHSA-q4x5-8cj6-52wg","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-q4x5-8cj6-52wg","identifiers":["GHSA-q4x5-8cj6-52wg","CVE-2026-47684"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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