Server-Side Request Forgery (SSRF) in Twenty - CVE-2026-33975
Published: July 28, 2026
Vulnerability identifier: #VU139928
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-33975
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Twenty
Affected software:
Twenty
Twenty
Detailed vulnerability description
The vulnerability allows a remote user to disclose sensitive information.
The vulnerability exists due to improper input validation in SecureHttpClientService when processing IPv4-mapped IPv6 URL addresses. A remote user can send a specially crafted URL using an IPv4-mapped IPv6 address to disclose sensitive information.
The issue arises because Node.js normalizes IPv4-mapped IPv6 addresses to hex form before the address reaches the connection logic, allowing requests to internal services and cloud metadata endpoints without DNS resolution.
How to mitigate CVE-2026-33975
Install security update from vendor's website.