{"id":73467,"date":"2025-09-10T01:30:08","date_gmt":"2025-09-10T01:30:08","guid":{"rendered":""},"modified":"2025-11-02T06:37:36","modified_gmt":"2025-11-02T12:37:36","slug":"cve-2025-26210-deepseek-xss-vulnerability-allows-potential-system-compromise","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-26210-deepseek-xss-vulnerability-allows-potential-system-compromise\/","title":{"rendered":"CVE-2025-26210: DeepSeek XSS Vulnerability Allows Potential System Compromise<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

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<\/a> into web pages viewed by other users. This vulnerability is particularly concerning as it can lead to system<\/a> compromise or data leakage, making it a high-risk issue that demands immediate attention from all affected parties.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-26210
\nSeverity: High, with a CVSS score of 8.8
\nAttack Vector: Network
\nPrivileges Required: None
\nUser Interaction: Required
\nImpact: Successful exploitation can lead to system<\/a> compromise and data leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

DeepSeek | R1 through V3.1<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The vulnerability is due<\/a> 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<\/a> 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<\/a> actions.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

A potential exploit might look something like this:<\/p>\n

GET \/chat?nickname=<script>malicious_code_here<\/script> HTTP\/1.1\nHost: run-html-chat.deepseeksvc.com<\/code><\/pre>\n
In this example, `<script>malicious_code_here<\/script>` is the injected JavaScript code. When a user views the webpage, the malicious JavaScript code is executed<\/a> in their browser.<\/p>\n
Mitigation<\/strong><\/p>\n
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.<\/p>\n","protected":false},"excerpt":{"rendered":"
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 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[],"product":[],"attack_vector":[81],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-73467","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-xss"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t