XSS in Deepseek Deepseek-R1
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.
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.006 (45.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Deepseek Deepseek-r1 — versions 1.0
- Deepseek Deepseek-v2
- Deepseek Deepseek-v3 — versions 1.0
- N/a — versions n/a
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve@mitre.org (Exploit, Third Party Advisory)
- cve@mitre.org (Exploit)
- cve@mitre.org (Permissions Required)
Frequently asked questions
- What is CVE-2025-26210?
- CVE-2025-26210 is a high-severity vulnerability in Deepseek Deepseek-R1, classified under Cross-site Scripting. CVSS score: 8.8/10. Published 2025-09-03.
- How severe is CVE-2025-26210?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2025-26210 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.