Opencti
CVE-2025-26621
HIGH
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Code injection prevention, sandbox exec
MITRE ATT&CK
2 techniques across 2 tactics: Execution, Initial Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS score of 7.6 (HIGH). Attack characteristics: network attack vector, low complexity, high privileges required, no user interaction not required. EPSS exploitation probability: 0.73%. |
| Exploit ScenarioDerived | A remote attacker could inject and execute arbitrary code within the application by sending crafted requests to the affected application. |
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Alert meAnalysisAIv1 – Mar 28, 2026
OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables. Rated high severity (CVSS 7.6), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.
RemediationAI
No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Never evaluate user-controlled input as code. Use sandboxing, disable dangerous functions, apply strict input validation.
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in pypi
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
This vulnerability is classified as Code Injection (CWE-94), which allows attackers to inject and execute arbitrary code within the application. OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables. Prior to version 6.5.2, any user with the capability manage customizations can edit webhook that will execute javascript code. This can be abused to cause a denial of service attack by prototype pollution, making the node js server running the OpenCTI frontend become unavailable. Version 6.5.2 fixes the issue. Affected products include: Citeum Opencti. Version information: version 6.5.2.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
DescriptionGitHub Advisory
OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables. Prior to version 6.5.2, any user with the capability manage customizations can edit webhook that will execute javascript code. This can be abused to cause a denial of service attack by prototype pollution, making the node js server running the OpenCTI frontend become unavailable. Version 6.5.2 fixes the issue.
Executive ViewAI
Organizations using OpenCTI face notable risk from CVE-2025-26621, a code injection vulnerability rated CVSS 7.6. Successful exploitation could allow attackers to execute arbitrary code or commands on affected systems, potentially leading to full system compromise. Organizations should apply vendor updates when available and consider compensating controls in the interim.
Apply vendor patch. If immediate patching is not feasible: (1) Deploy WAF rules to block injection patterns; (2) Restrict network access to affected components; (3) Enable enhanced logging for suspicious activity.
Threat Intelligence Overview
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Code injection occurs when an application accepts user input and passes it directly into a language interpreter or evaluator without proper sanitization.
Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.
Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.
Affected Products (CPE)GitHub Advisory
Unauthenticated attackers can escalate privileges in OpenCTI 6.6.0-6.9.12 by impersonating any user account, including t
Server-Side Template Injection in OpenCTI notifier templates allows privileged administrators with 'Manage customization
OpenCTI 3.3.1 is vulnerable to a directory traversal attack via the static/css endpoint. An unauthenticated attacker can
OpenCTI 3.3.1 is vulnerable to a reflected cross-site scripting (XSS) attack via the /graphql endpoint. An attacker can
OpenCTI is an open cyber threat intelligence (CTI) platform. Rated critical severity (CVSS 9.1), this vulnerability is r
Authenticated attackers can delete arbitrary workspaces in OpenCTI versions prior to 6.8.1 due to missing ownership chec
OpenCTI is an open-source cyber threat intelligence platform. Rated high severity (CVSS 8.1), this vulnerability is remo
OpenCTI is an open source platform allowing organizations to manage their cyber threat intelligence knowledge and observ
In OpenCTI through 5.2.4, a broken access control vulnerability has been identified in the profile endpoint. Rated high
Privilege escalation in OpenCTI prior to 6.9.7 allows an organization admin to gain elevated platform-wide privileges by
Authorization bypass in OpenCTI prior to version 7.260326.0 lets any authenticated user holding the KNOWLEDGE_KNUPDATE p
Elasticsearch Painless script injection via OpenCTI's GraphQL API allows any authenticated user holding the KNOWLEDGE ca
GitHub PoC
Exploit-DB