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CVE-2026-47684— Sync-in Server: SSRF protection bypass via IPv4-mapped IPv6 addresses in regExpPrivateIP

Quick assessment

Affected
Sync-in server
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Sync-in server是Sync-in的服务器设备。 Sync-in server 2.3.0之前版本存在服务端请求伪造漏洞，该漏洞源于URL下载功能使用的私有IP黑名单正则表达式不匹配IPv4映射的IPv6地址，可能导致SSRF保护被绕过。

CVSS 7.7 · High EPSS 0.38% · P29

Affected Version Matrix 1

VendorProduct Version RangeStatus
Sync-in server < 2.3.0 affected
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I. Basic Information for CVE-2026-47684

Vulnerability Information
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Vulnerability Title
Sync-in Server: SSRF protection bypass via IPv4-mapped IPv6 addresses in regExpPrivateIP
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Sync-in server 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Sync-in server是Sync-in的服务器设备。 Sync-in server 2.3.0之前版本存在服务端请求伪造漏洞，该漏洞源于URL下载功能使用的私有IP黑名单正则表达式不匹配IPv4映射的IPv6地址，可能导致SSRF保护被绕过。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Sync-in server < 2.3.0 -

II. Public POCs for CVE-2026-47684

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7399 chars
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Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-47684

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Vendor Advisories for CVE-2026-47684 (1)

Vendor Pages for CVE-2026-47684 (1)

IV. Related Vulnerabilities

Same product: server
Same vendor: Sync-in
Same weakness: CWE-918

V. Comments for CVE-2026-47684

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