CVE-2025-26210
HIGHCVSS 8.8/10EPSS 0.54%
Last modified
CVE-2025-26210 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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.. EPSS estimates a 0.54% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Deepseek | Deepseek-R1 | 1.0 |
| Deepseek | Deepseek-V2 | All versions |
| Deepseek | Deepseek-V3 | 1.0 |
References
- https://deepseek.comPermissions Required
- https://hackmd.io/@MrqrFIlhQFi7vUwkqbrXDw/deepseekExploit, Third Party Advisory
- https://youtu.be/IgQwy52FVT4Exploit
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2025-26210?
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.
How severe is CVE-2025-26210?
CVE-2025-26210 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.54% probability of exploitation in the next 30 days.
How do I fix CVE-2025-26210?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2025-26210?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST