How severe is CVE-2025-26210?

CVE-2025-26210 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-26210 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-26210?

CVE-2025-26210 primarily affects Deepseek Deepseek-r1. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-26210?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-26210 have an EU (EUVD) identifier?

Yes. CVE-2025-26210 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-26507.

When was CVE-2025-26210 published?

CVE-2025-26210 was published on 2025-09-03 and last updated on 2026-06-17.

CVE-2025-26210

CVE-2025-26210 is a high-severity vulnerability in Deepseek Deepseek-r1 with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 1% (42nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-26507
Weakness: CWE-79
Affected product: Deepseek Deepseek-r1
Published: 2025-09-03
Last modified: 2026-06-17

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.

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 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-26210 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-26210?: CVE-2025-26210 primarily affects Deepseek Deepseek-r1. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-26210?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-26210 have an EU (EUVD) identifier?: Yes. CVE-2025-26210 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-26507.
When was CVE-2025-26210 published?: CVE-2025-26210 was published on 2025-09-03 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:deepseek:deepseek-r1:1.0:*:*:*:*:*:*:*
cpe:2.3:a:deepseek:deepseek-v2:-:*:*:*:*:*:*:*
cpe:2.3:a:deepseek:deepseek-v3:1.0:*:*:*:*:*:*:*

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