CVE-2025-26210
High
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.
SeverityHigh
CVSS8.8
Exploit probability—
ProductDeepseek-r1
PublishedSep 3, 2025
First seenSep 3, 2025
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| deepseek deepseek-r1 | 1.0 | — |
| deepseek deepseek-v2 | No range specified | — |
| deepseek deepseek-v3 | 1.0 | — |
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