CVE-2026-35212: medium-severity vulnerability in OpenCTI-Platform opencti
OpenCTI has XSS in the rendering of email-message observable body data
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.3epss 0.1%
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/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Affected products
OpenCTI-Platform · openctiRelated CVEs — OpenCTI-Platform opencti
In the same product, most dangerous first.
CVE-2026-27960CRITICALOpenCTI privilege escalation and unauthenticated access via default admin accountEPSS 7.1%CVE-2026-39980CRITICALOpenCTI affected by RCE via notifier templateEPSS 1.4%CVE-2025-24977CRITICALOpenCTI has remote code execution and sensitive secrets exposed through web hookEPSS 0.9%CVE-2024-45404HIGHOpenCTI's lack of Rate Limit lead to OTP brute forcingEPSS 0.6%CVE-2026-35211MEDIUMOpenCTI: Elasticsearch Painless Script Injection via GraphQL `script` filter operator allows authenticated user to exfiltrate data and cause DoSEPSS 0.5%CVE-2026-76821HIGHOpenCTI: User-Controlled ReDoS in JSON Ingestion MapperEPSS 0.5%