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CVE-2025-26210

Deepseek Deepseek-r1 cross-site scripting (XSS)

8.8 HIGHPublic exploitEPSS 0.58%
  1. Published3 Sept 2025

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

Deepseek Deepseek-r11.0
Deepseek Deepseek-v2all versions
Deepseek Deepseek-v31.0

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2025-26210 being actively exploited?

CVE-2025-26210 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.58%.

How severe is CVE-2025-26210?

CVE-2025-26210 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 0.58% probability of exploitation.

Which products are affected by CVE-2025-26210?

Affected products include Deepseek Deepseek-r1, Deepseek Deepseek-v2, Deepseek Deepseek-v3.

How do I fix CVE-2025-26210?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-26210 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.