PT-2026-42752 · Sync In · Sync In

CVE-2026-47684 · Published 2026-05-22 · Updated 2026-06-16

Positive Technologies (AI Summary)

CVSS v3.1

7.7

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Sync-in versions prior to 2.3

Description An issue exists in the URL download feature where the private IP blocklist regex fails to match IPv4-mapped IPv6 addresses, such as ::ffff:127.0.0.1. On dual-stack systems, Node.js may report a socket's remote address in this format, allowing the Server-Side Request Forgery (SSRF) protection to be bypassed. This occurs because the regExpPrivateIP regex in backend/src/applications/files/utils/url-file.ts does not include ::ffff: prefixed variants, which affects the check performed by the downloadFromUrl() function in backend/src/applications/files/services/files-manager.service.ts. An attacker can provide a crafted URL pointing to an internal address, causing the server to fetch internal resources that should be blocked.

Recommendations Update to version 2.3.

Exploit

Fix

SSRF

Weakness Enumeration

CWE-918

Related Identifiers

CVE-2026-47684

GHSA-Q4X5-8CJ6-52WG

Affected Products

Sync In

References · 12

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47684.json · Exploit
• 🔥 https://github.com/Sync-in/server/security/advisories/GHSA-q4x5-8cj6-52wg · Exploit
• https://osv.dev/vulnerability/GHSA-q4x5-8cj6-52wg · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-47684 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-47684 · Security Note
• https://github.com/Sync-in/server/releases/tag/v2.3.0 · Note
• https://github.com/Sync-in/server · Note
• https://i.redd.it/axopxwd5bo2h1.png · Reddit Post
• https://twitter.com/CVEnew/status/2066980902446768340 · Twitter Post
• https://i.redd.it/tn1fijyubo2h1.png · Reddit Post
• https://t.me/cveNotify/168733 · Telegram Post
• https://t.me/CVEtracker/57005 · Telegram Post