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.

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-q4x5-8cj6-52wg Sync-in Server: SSRF protection bypass via IPv4-mapped IPv6 addresses in regExpPrivateIP
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Tue, 16 Jun 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 16 Jun 2026 17:15:00 +0000

Type Values Removed Values Added
First Time appeared Sync-in
Sync-in server
Vendors & Products Sync-in
Sync-in server

Tue, 16 Jun 2026 15:00:00 +0000

Type Values Removed Values Added
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.
Title Sync-in Server: SSRF protection bypass via IPv4-mapped IPv6 addresses in regExpPrivateIP
Weaknesses CWE-918
References
Metrics cvssV3_1

{'score': 7.7, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-06-16T17:10:12.548Z

Reserved: 2026-05-19T21:18:20.402Z

Link: CVE-2026-47684

cve-icon Vulnrichment

Updated: 2026-06-16T17:01:51.847Z

cve-icon NVD

Status : Deferred

Published: 2026-06-16T15:16:41.063

Modified: 2026-06-16T15:46:16.230

Link: CVE-2026-47684

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-16T17:00:13Z

Weaknesses