CVE-2025-26210 Cross-site scripting in n/a
Cross-site scripting in DeepSeek R1 through V3.1 allows JavaScript execution, potentially enabling session hijacking or malicious actions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2025-26210?
CVE-2025-26210 is a high-severity cross-site scripting vulnerability in n/a, published on 3 Sep 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2025-26210?
It affects 3 products.
Products include Deepseek Deepseek-R1, Deepseek Deepseek-V2, Deepseek Deepseek-V3.
How do I fix CVE-2025-26210?
No fix has been published for CVE-2025-26210 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2025-26210 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-26210 exists.
Sources
Also known as GHSA-v669-8m26-4r4w.