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TI-2026-27582 Aliases CVE-2026-35451

Twenty: Stored XSS via BlockNote FileBlock

Priority MEDIUM 59CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

Twenty is an open source CRM. Prior to 1.20.6, a Stored Cross-Site Scripting (XSS) vulnerability exists in the BlockNote editor component. Due to a lack of protocol validation in the FileBlock component and insufficient server-side inspection of block content, an attacker can inject a javascript: URI into the url property of a file block. This allows the execution of arbitrary JavaScript when a user clicks on the malicious file attachment. This vulnerability is fixed in 1.20.6.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00309 23rd percentileScored 2026-11-07
Fix Fixed twenty (twentyhq): 1.20.6

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
twentyhqtwentybefore 1.20.61.20.6Patch availableCNA
  • twenty Vendortwentyhq Affected before 1.20.6 Fixed in 1.20.6 Patch available 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

  • Fix · CNA twenty (twentyhq) Fixed in 1.20.6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-35451

References

Other 2

  • 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-2026-26316 twenty-server SSRF protection bypass via IPv4-mapped IPv6 address normalization CVSS 4.0HIGH 8.3
  • TI-2026-40122 Twenty: Cross-workspace IDOR in AgentTurnResolver 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