CVE-2026-47684
Sync-in Server: SSRF protection bypass via IPv4-mapped IPv6 addresses in regExpPrivateIP
CVSS Score
7.7
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-918 |
| Vendor | sync-in |
| Product | server |
| Published | Jun 16, 2026 |
| Last Updated | Jun 16, 2026 |
Stay Ahead of the Next One
Get instant alerts for sync-in server
Be the first to know when new high vulnerabilities affecting sync-in server are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None
Affected Versions
Sync-in / server
< 2.3.0