Vulnerability · Published Jun 2, 2026 · Assigned by GitHub_M
CVE-2026-35212OpenCTI has XSS in the rendering of email-message observable body data
Medium 5.3
In plain English
A medium-severity cross-site scripting in opencti from OpenCTI-Platform. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | pycti | 7.260227.0 | PYSEC-2026-203 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| OpenCTI-Platform | opencti | < 7.260227.0 |
Weakness: CWE-79 · 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