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TI-2026-26316 Aliases CVE-2026-33975

twenty-server SSRF protection bypass via IPv4-mapped IPv6 address normalization

Priority HIGH 69CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-918 and the CVSS impact.

Summary

Twenty is an open source CRM built with NestJS (Node.js). In versions 1.18.0 and earlier, the SSRF protection in twenty-server's SecureHttpClientService can be bypassed using IPv4-mapped IPv6 addresses in URL IP literals. Node.js's URL parser normalizes IPv4-mapped IPv6 addresses to compressed hex form (e.g., ::ffff:169.254.169.254 becomes ::ffff:a9fe:a9fe), but the isPrivateIp utility only recognizes the dotted-decimal notation. As a result, the hex form passes the SSRF check unchecked. Additionally, the socket lookup validation event does not fire for IP literal addresses, bypassing the second validation layer. An authenticated user can reach any internal IP, including cloud metadata endpoints, to exfiltrate credentials such as IAM keys.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0024 15th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
twentyhqtwentyup to 1.18.0—No fix listedCNA
  • twenty Vendortwentyhq Affected up to 1.18.0 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:twenty:twenty:*:*:*:*:*:*:*:*——twentyhq
  • cpe:2.3:a:twenty:twenty:*:*:*:*:*:*:*:* Versions — — ·twentyhq

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-33975

References

Other 1

  • TI-2026-21368 An issue in Twenty CRM v1.15.0 and before allows a remote attacker to execute arbitrary… CVSS 3.1CRITICAL 9.8
  • TI-2026-34280 Twenty: SQL Injection via the timeZone field CVSS 3.1CRITICAL 9.9
  • TI-2026-51276 Twenty: SQL Injection in the `searchVector` Field Settings Allows Arbitrary PostgreSQL Execution CVSS 3.1CRITICAL 9.1
  • TI-2026-32616 Twenty: Stored Cross-Site Scripting via Unsanitized File Serving (Missing Content-Type/Content-Disposition Headers) CVSS 3.1HIGH 8.7
  • TI-2026-40122 Twenty: Cross-workspace IDOR in AgentTurnResolver CVSS 3.1HIGH 7.6
  • TI-2024-18876 The CRM platform Twenty is vulnerable to stored cross site scripting via file upload in… CVSS 3.1HIGH 7.6
See all 13 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences