CVE-2026-47684 | THREATINT

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.

PUBLISHED Reserved 2026-05-19 | Published 2026-06-16 | Updated 2026-06-16 | Assigner GitHub_M

HIGH: 7.7CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Problem types

CWE-918: Server-Side Request Forgery (SSRF)

Product status

< 2.3.0

affected

References

github.com/...server/security/advisories/GHSA-q4x5-8cj6-52wg exploit

github.com/...server/security/advisories/GHSA-q4x5-8cj6-52wg

github.com/Sync-in/server/releases/tag/v2.3.0

cve.org (CVE-2026-47684)

nvd.nist.gov (CVE-2026-47684)

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