What is CVE-2026-47684?

CVE-2026-47684 is a high-severity vulnerability in Sync-in Server, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.7/10. Published 2026-06-16.

How severe is CVE-2026-47684?

High severity. CVSS v3 base score is 7.7 out of 10.

SSRF in Sync-in Server

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…

Vulnerability class: SSRF (Server-Side Request Forgery)

CVSS v3 metric

CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.

Affected products

Sync-in Server — versions < 2.3.0

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

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

Frequently asked questions

What is CVE-2026-47684?: CVE-2026-47684 is a high-severity vulnerability in Sync-in Server, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.7/10. Published 2026-06-16.
How severe is CVE-2026-47684?: High severity. CVSS v3 base score is 7.7 out of 10.