CVE-2026-35212 MEDIUM

CVE-2026-35212: OpenCTI has XSS in the rendering of email-message observable body data

Vendor Opencti-Platform
Product opencti
Weakness CWE-79 · XSS
Published June 2, 2026
Last update June 3, 2026

CVSS base score

5.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

June 2, 2026 CVE published
June 3, 2026 Record updated