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CVE-2025-26210: DeepSeek XSS Vulnerability Allows Potential System Compromise

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Overview

DeepSeek, commonly used for its robust data aggregation capabilities, has recently been found to have a significant vulnerability in versions R1 through V3.1. This vulnerability, tagged as CVE-2025-26210, exposes users to potential Cross-Site Scripting (XSS) attacks. XSS remains one of the most prevalent security risks on the web, allowing attackers to inject malicious code into web pages viewed by other users. This vulnerability is particularly concerning as it can lead to system compromise or data leakage, making it a high-risk issue that demands immediate attention from all affected parties.

Vulnerability Summary

CVE ID: CVE-2025-26210
Severity: High, with a CVSS score of 8.8
Attack Vector: Network
Privileges Required: None
User Interaction: Required
Impact: Successful exploitation can lead to system compromise and data leakage

Affected Products

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Product | Affected Versions

DeepSeek | R1 through V3.1

How the Exploit Works

The vulnerability is due to insufficient sanitizing of user-supplied inputs in the `run-html-chat.deepseeksvc.com` domain. An attacker can exploit this weakness by sending a specially crafted input to the affected software, which then reflects the malicious script on the web page. When an unsuspecting user interacts with the infected web page, the malicious script gets executed within the context of the victim’s browser, potentially leading to unauthorized actions.

Conceptual Example Code

A potential exploit might look something like this:

GET /chat?nickname=<script>malicious_code_here</script> HTTP/1.1
Host: run-html-chat.deepseeksvc.com

In this example, `` is the injected JavaScript code. When a user views the webpage, the malicious JavaScript code is executed in their browser.

Mitigation

Until a vendor patch is available, the recommended mitigation method is to use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to detect and block potential XSS attempts. It is also advised to not click on untrusted links and be wary of unexpected behavior on the `run-html-chat.deepseeksvc.com` domain.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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