CVE-2026-35212CWE-79

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

Medium · published June 2, 2026

CVSS v4.0
5.3
EPSS
0%
Percentile
15.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
5.3 · MEDIUM
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
EPSS
0.00253 · 15.9th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-06-02T21:28Z
EPSS history
Timeline
  • 02 JUN 21:28Z
    OpenCTI has XSS in the rendering of email-message observable body data
    cvelistv5