Reflected XSS in OpenCTI 3.3.1 /graphql Endpoint

Detection Guidance

This vulnerability can be detected by sending crafted GET requests to the /graphql endpoint containing malicious payloads in the query string and observing if the injected JavaScript executes. For example, you can use curl to send a test request: curl "http://<target>/graphql?'"--><\/style><\/scRipt><scRipt>alert('Raif_Berkay')<\/scRipt>" and check if an alert is triggered in the browser or if the response reflects the injected script. Monitoring web server logs for suspicious query strings targeting /graphql may also help detect attempts.

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Executive Summary

This vulnerability is a reflected cross-site scripting (XSS) attack in OpenCTI 3.3.1 via the /graphql endpoint. An attacker can send a specially crafted GET request containing malicious JavaScript code in the query string, which then executes in the victim's browser when they access the URL. This allows the attacker to run arbitrary JavaScript code on the victim's machine.

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Impact Analysis

The vulnerability can lead to execution of arbitrary JavaScript in the victim's browser, which may result in theft of sensitive information, session hijacking, or other malicious actions performed on behalf of the victim without their consent.

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Mitigation Strategies

Immediate mitigation steps include restricting access to the /graphql endpoint, applying input validation and sanitization to prevent injection of malicious scripts, and updating OpenCTI to a version where this vulnerability is fixed. Additionally, consider implementing web application firewalls (WAF) rules to block malicious payloads targeting this endpoint.

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