CVE-2025-26210

HIGH 8.8CVE-2025-26210 · Published 03/09/2025 · updated 17/06/2026

In short

CVE-2025-26210 is a HIGH (CVSS 8.8) vulnerability affecting deepseek-r1 (deepseek), deepseek-v3 (deepseek).
Chance of exploitation in the next 30 days (EPSS): 0.60%, higher than 49.0% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
deepseek-r1 deepseek	`= 1.0`	No fix yet
deepseek-v3 deepseek	`= 1.0`	No fix yet

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.

References

deepseek.com · Permissions Required
hackmd.io/@MrqrFIlhQFi7vUwkqbrXDw/deepseek · Exploit
youtu.be/IgQwy52FVT4 · Exploit

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