CVE-2026-47684

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.

Score

CVSS 3.1 7.7 High

Status

Deferred - security-advisories@github.com

Published

2026-06-16

Last modified

2026-10-25

Weaknesses

CWE-918

Affected products

• Server (Sync-in)

References

• https://github.com/Sync-in/server/security/advisories/GHSA-q4x5-8cj6-52wg
• https://github.com/Sync-in/server/releases/tag/v2.3.0