CVE-2026-47684

HIGH

Sync-in Server: SSRF protection bypass via IPv4-mapped IPv6 addresses in regExpPrivateIP

Title source: cna
STIX 2.1

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.

References (2)

Core 2
Core References
X_Refsource_Misc x_refsource_misc
https://github.com/Sync-in/server/releases/tag/v2.3.0

Scores

CVSS v3 7.7
EPSS 0.0022
EPSS Percentile 12.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-918
Status published
Products (2)
sync-in/server 0 - 2.3.0npm
Sync-in/server < 2.3.0
Published Jun 16, 2026
Tracked Since Jun 16, 2026