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6 vulnerabilities by DeepSeek
CVE-2026-82533 (GCVE-0-2026-82533)
Vulnerability from nvd – Published: 2026-09-08 16:59 – Updated: 2026-09-08 17:21 X_Open Source
VLAI
EPSS
VEX
Title
DeepSeek Harness < 0.1.2-alpha.1 Authentication Bypass via Host Header Spoofing
Summary
DeepSeek Harness before 0.1.2-alpha.1 contains an authentication bypass vulnerability in its local HTTP control-plane API that allows attackers to gain full agent control by supplying a spoofed Host header, as the server validates only the client-supplied Host header value rather than the actual TCP connection origin. Attackers can exploit this flaw to invoke privileged commands such as commands/execute with danger-full-access permissions, escalate session approval policies to unconfined execution, and retrieve all stored conversations without any credential or API key.
Severity
9.6 (Critical)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-08 17:20 UTC
CWE
- CWE-807 - Reliance on Untrusted Inputs in a Security Decision
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/deepseek-ai/deepseek-harness/r… | release-notes |
| https://github.com/deepseek-ai/deepseek-harness/c… | patch |
| https://www.vulncheck.com/advisories/deepseek-har… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| DeepSeek | DeepSeek Harness |
Affected:
0 , < 0.1.2-alpha.1
(custom)
|
Date Public
2026-08-25 00:00
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CVE-2025-63872 (GCVE-0-2025-63872)
Vulnerability from nvd – Published: 2025-12-02 00:00 – Updated: 2025-12-02 19:29
VLAI
EPSS
VEX
Summary
DeepSeek V3.2 has a Cross Site Scripting (XSS) vulnerability, which allows JavaScript execution through model-generated SVG content.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-12-02 19:29 UTC
CWE
- n/a
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
1 reference
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CVE-2025-26210 (GCVE-0-2025-26210)
Vulnerability from nvd – Published: 2025-09-03 00:00 – Updated: 2025-09-08 17:39 Disputed
VLAI
EPSS
VEX
Summary
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.
Severity
8.8 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-09-08 17:37 UTC
CWE
- n/a
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
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CVE-2026-82533 (GCVE-0-2026-82533)
Vulnerability from cvelistv5 – Published: 2026-09-08 16:59 – Updated: 2026-09-08 17:21 X_Open Source
VLAI
EPSS
VEX
Title
DeepSeek Harness < 0.1.2-alpha.1 Authentication Bypass via Host Header Spoofing
Summary
DeepSeek Harness before 0.1.2-alpha.1 contains an authentication bypass vulnerability in its local HTTP control-plane API that allows attackers to gain full agent control by supplying a spoofed Host header, as the server validates only the client-supplied Host header value rather than the actual TCP connection origin. Attackers can exploit this flaw to invoke privileged commands such as commands/execute with danger-full-access permissions, escalate session approval policies to unconfined execution, and retrieve all stored conversations without any credential or API key.
Severity
9.6 (Critical)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-08 17:20 UTC
CWE
- CWE-807 - Reliance on Untrusted Inputs in a Security Decision
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/deepseek-ai/deepseek-harness/r… | release-notes |
| https://github.com/deepseek-ai/deepseek-harness/c… | patch |
| https://www.vulncheck.com/advisories/deepseek-har… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| DeepSeek | DeepSeek Harness |
Affected:
0 , < 0.1.2-alpha.1
(custom)
|
Date Public
2026-08-25 00:00
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CVE-2025-63872 (GCVE-0-2025-63872)
Vulnerability from cvelistv5 – Published: 2025-12-02 00:00 – Updated: 2025-12-02 19:29
VLAI
EPSS
VEX
Summary
DeepSeek V3.2 has a Cross Site Scripting (XSS) vulnerability, which allows JavaScript execution through model-generated SVG content.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-12-02 19:29 UTC
CWE
- n/a
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2025-63872",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-12-02T19:29:12.821460Z",
"version": "2.0.3"
},
"type": "ssvc"
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],
"problemTypes": [
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"cweId": "CWE-79",
"description": "CWE-79 Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "n/a",
"vendor": "n/a",
"versions": [
{
"status": "affected",
"version": "n/a"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "DeepSeek V3.2 has a Cross Site Scripting (XSS) vulnerability, which allows JavaScript execution through model-generated SVG content."
}
],
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"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
"shortName": "mitre"
},
"references": [
{
"url": "https://medium.com/@vinitkundu14/cve-2025-63872-svg-based-xss-in-deepseek-chat-v3-2-db4ebc1f1f28"
}
]
}
},
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"datePublished": "2025-12-02T00:00:00.000Z",
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CVE-2025-26210 (GCVE-0-2025-26210)
Vulnerability from cvelistv5 – Published: 2025-09-03 00:00 – Updated: 2025-09-08 17:39 Disputed
VLAI
EPSS
VEX
Summary
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.
Severity
8.8 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-09-08 17:37 UTC
CWE
- n/a
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
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}
},
{
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{
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"timestamp": "2025-09-08T17:37:20.327016Z",
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},
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}
]
}
],
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"dateUpdated": "2025-09-08T17:39:51.749Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "n/a",
"vendor": "n/a",
"versions": [
{
"status": "affected",
"version": "n/a"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "n/a",
"lang": "en",
"type": "text"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-09-05T19:54:41.025Z",
"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
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},
"references": [
{
"url": "https://hackmd.io/@MrqrFIlhQFi7vUwkqbrXDw/deepseek"
},
{
"url": "https://youtu.be/IgQwy52FVT4"
},
{
"url": "https://deepseek.com"
}
],
"tags": [
"disputed"
]
}
},
"cveMetadata": {
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"assignerShortName": "mitre",
"cveId": "CVE-2025-26210",
"datePublished": "2025-09-03T00:00:00.000Z",
"dateReserved": "2025-02-07T00:00:00.000Z",
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"state": "PUBLISHED"
},
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