VulnerabilityAnalyzed

CVE-2026-35212

Versions prior to 7.260227.0 are vulnerable to XSS in the rendering of email-message observable body data.

MEDIUM 5.3EPSS 0.15%

Does this matter?

Lower severity and a low EPSS score (0.15%). Track it; it rarely justifies an emergency change on its own.

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.

CVSS 4.0: 5.3 MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
EPSS: 0.15% probability · 4th percentile
CISA KEV: Not listed
Weakness: CWE-79
Affected: citeum/opencti
Source: security-advisories@github.com

References

https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-rg6r-x26x-63vqVendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.