CVE-2026-47684 | Sync-in Server is a secure, open-source platform for file st… | CVSS 7.7 HIGH

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.

Metadata

CVE ID: CVE-2026-47684
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-05-19 21:18 UTC
Published: 2026-06-16 14:31 UTC
Last updated: 2026-06-16 17:10 UTC
Primary CWE: CWE-918
CWE-918: Server-Side Request Forgery (SSRF)
Vendor / Product: Sync-in / server
Sources: cve.org · NVD

Severity & Metrics

7.7 HIGH CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: no
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
Sync-in	server	—	< 2.3.0

Weakness (CWE)

CWE	Source	Description
CWE-918	cna	CWE-918: Server-Side Request Forgery (SSRF)

CVSS scores (1)

Score	Severity	Version	Source	Vector
7.7	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

References (2)

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