What’s Vulnerable › Vulnerabilities

CVE-2026-47684: Sync-in Server: SSRF protection bypass via IPv4-mapped IPv6 addresses in regExpPrivateIP

• Severity: high (CVSS 7.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-16 · updated 2026-10-25
• Weakness: CWE-918

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.

Affected products

• Sync-in server: before 2.3.0

References

• 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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