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TI-2026-21496 Aliases CVE-2026-27023

Twenty: SSRF protection bypass via HTTP redirect following in secure HTTP client

Priority LOW 22CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-918 and the CVSS impact.

Summary

Twenty is an open source CRM. Prior to version 1.18, the SSRF protection in SecureHttpClientService validated request URLs at the request level but did not validate redirect targets. An authenticated user who could control outbound request URLs (e.g., webhook endpoints, image URLs) could bypass private IP blocking by redirecting through an attacker-controlled server. This issue has been patched in version 1.18.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00231 14th percentileScored 2026-11-07
Fix Fixed twenty (twentyhq): 1.18

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
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
twentyhqtwentybefore 1.181.18Patch availableCNA
  • twenty Vendortwentyhq Affected before 1.18 Fixed in 1.18 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:twenty:twenty:*:*:*:*:*:*:*:*before 1.18.0Vulnerabletwentyhq
  • cpe:2.3:a:twenty:twenty:*:*:*:*:*:*:*:* Versions before 1.18.0 Vulnerable ·twentyhq

Remediation

  • Fix · CNA twenty (twentyhq) Fixed in 1.18

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-27023

References

Advisory 1

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-2026-32616 Twenty: Stored Cross-Site Scripting via Unsanitized File Serving (Missing Content-Type/Content-Disposition Headers) CVSS 3.1HIGH 8.7
  • TI-2024-18876 The CRM platform Twenty is vulnerable to stored cross site scripting via file upload in… CVSS 3.1HIGH 7.6
  • TI-2024-18877 The CRM platform Twenty version 0.3.0 is vulnerable to SSRF via file upload. CVSS 3.1MEDIUM 5.4

Sources

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