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CVE-2026-35211— OpenCTI: Elasticsearch Painless Script Injection via GraphQL `script` filter operator allows authenticated user to exfiltrate data and cause DoS

Quick assessment

Affected
OpenCTI-Platform opencti
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenCTI是OpenCTI组织开源的一个开放网络威胁情报平台。 OpenCTI 7.260401.0之前版本存在安全漏洞，该漏洞源于GraphQL API的FilterOperator枚举中暴露脚本过滤器操作符，允许经过身份验证的用户在未经验证或清理的情况下将用户提供的Elasticsearch Painless脚本值直接传入搜索查询，从而导致消耗集群CPU资源并降低或拒绝服务。

CVSS 6.5 · Medium EPSS 0.52% · P42

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
OpenCTI-Platform opencti < 7.260401.0 affected
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I. Basic Information for CVE-2026-35211

Vulnerability Information
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Vulnerability Title
OpenCTI: Elasticsearch Painless Script Injection via GraphQL `script` filter operator allows authenticated user to exfiltrate data and cause DoS
Source: CVE Program / CVE List V5
Vulnerability Description
OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables. Prior to 7.260401.0, the OpenCTI GraphQL API exposes a script filter operator in its FilterOperator enum that allows any authenticated user with the KNOWLEDGE capability to pass user-supplied Elasticsearch Painless script values directly into search queries without validation or sanitization, allowing computationally expensive scripts to consume cluster CPU resources and degrade or deny service for all users. This issue is fixed in version 7.260401.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
OpenCTI 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenCTI是OpenCTI组织开源的一个开放网络威胁情报平台。 OpenCTI 7.260401.0之前版本存在安全漏洞，该漏洞源于GraphQL API的FilterOperator枚举中暴露脚本过滤器操作符，允许经过身份验证的用户在未经验证或清理的情况下将用户提供的Elasticsearch Painless脚本值直接传入搜索查询，从而导致消耗集群CPU资源并降低或拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenCTI-Platform opencti < 7.260401.0 -

II. Public POCs for CVE-2026-35211

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III. Intelligence Information for CVE-2026-35211

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Patches & Fixes for CVE-2026-35211 (2)

Vendor Advisories for CVE-2026-35211 (1)

Vendor Pages for CVE-2026-35211 (1)

IV. Related Vulnerabilities

Same product: opencti
Same vendor: OpenCTI-Platform
Same weakness: CWE-94

V. Comments for CVE-2026-35211

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