CVE-2025-26210

Published: Sep 3, 2025Modified: Jun 17, 2026

8.8

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploitability: 2.8 / Impact: 5.9

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Description

DeepSeek R1 through V3.1 allows XSS, as demonstrated by JavaScript execution in the context of the run-html-chat.deepseeksvc.com domain. NOTE: some third parties have indicated that this is intended behavior.

Affected (3)

Products: Deepseek: Deepseek R1, Deepseek V2, Deepseek V3

3 products

Configuration A

3 vulnerable

Vulnerable Software	Affected Versions
Deepseek Deepseek R1	Version 1.0
Deepseek Deepseek V2	All versions
Deepseek Deepseek V3	Version 1.0

Related CWEs

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

References (3)

https://deepseek.com

Source: cve@mitre.org

Permissions Required

https://hackmd.io/@MrqrFIlhQFi7vUwkqbrXDw/deepseek

Source: cve@mitre.org

ExploitThird Party Advisory

https://youtu.be/IgQwy52FVT4

Source: cve@mitre.org

Exploit

Timeline

No history available yet.