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TI-2026-27365 Aliases CVE-2026-35212

OpenCTI has XSS in the rendering of email-message observable body data

Priority LOW 29CWE-79Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables. Versions prior to 7.260227.0 are vulnerable to XSS in the rendering of email-message observable body data. The content of the body field isn't appropriately sanitized when being rendered. Does require user interaction but could be exploited by someone sharing stix or any of the ingester. This could lead to CSRF and then large scale session theft. Version 7.260227.0 contains a fix.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00149 4th percentileScored 2026-11-07
Fix Fixed opencti (OpenCTI-Platform): 7.260227.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
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
OpenCTI-Platformopenctibefore 7.260227.07.260227.0Patch availableCNA
  • opencti VendorOpenCTI-Platform Affected before 7.260227.0 Fixed in 7.260227.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:citeum:opencti:*:*:*:*:*:*:*:*before 7.260227.0VulnerableOpenCTI-Platform
  • cpe:2.3:a:citeum:opencti:*:*:*:*:*:*:*:* Versions before 7.260227.0 Vulnerable ·OpenCTI-Platform

Remediation

  • Fix · CNA opencti (OpenCTI-Platform) Fixed in 7.260227.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-35212

References

Advisory 1

  • TI-2024-24682 OpenCTI May Bypass Introspection Restriction CVSS 3.1HIGH 8.2
  • TI-2024-30453 OpenCTI's lack of Rate Limit lead to OTP brute forcing CVSS 3.1HIGH 8.1
  • TI-2020-19176 OpenCTI 3.3.1 - Directory Traversal CVSS 4.0HIGH 7.1
  • TI-2026-22303 OpenCTI privilege escalation and unauthenticated access via default admin account CVSS 3.1CRITICAL 9.8
  • TI-2020-19179 OpenCTI 3.3.1 - Cross Site Scripting CVSS 4.0MEDIUM 5.1
  • TI-2024-30771 OpenCTI leaks support information due to inadequate access control CVSS 3.1MEDIUM 4.3
See all 21 →

Sources

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