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Vulnerability record · CVE-2026-47684 · published 16 June 2026

CVE-2026-47684: Server-side request forgery (SSRF) vulnerability

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.

7.7 CVSS 3.1 High EPSS 0.38% · top 71.1% CWE-918 · Server-side request forgery (SSRF) Deferred
7.7CVSS 3.1 base score
0.38%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

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.

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

References

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

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-47684), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.