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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: 2026-09-10 14:57 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 that grants unauthenticated access to its local HTTP agent-control API by accepting a client-supplied loopback Host header in place of validating the actual TCP connection origin. On the default configuration, a confined tool-executed process can reach the loopback API without any port exposure and use it to escape its own OS sandbox, escalate to unconfined execution, and disable the approval prompt. When the port is externally reachable via tunnel, SSH forward, or reverse proxy, a remote attacker can exploit the same flaw to create sessions, execute arbitrary commands, and exfiltrate stored conversation transcripts without credentials.
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
4 references
| URL | Tags |
|---|---|
| https://www.ox.security/blog/cve-2026-82533-deeps… | technical-descriptionexploit |
| 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: 2026-09-10 14:57 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 that grants unauthenticated access to its local HTTP agent-control API by accepting a client-supplied loopback Host header in place of validating the actual TCP connection origin. On the default configuration, a confined tool-executed process can reach the loopback API without any port exposure and use it to escape its own OS sandbox, escalate to unconfined execution, and disable the approval prompt. When the port is externally reachable via tunnel, SSH forward, or reverse proxy, a remote attacker can exploit the same flaw to create sessions, execute arbitrary commands, and exfiltrate stored conversation transcripts without credentials.
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
4 references
| URL | Tags |
|---|---|
| https://www.ox.security/blog/cve-2026-82533-deeps… | technical-descriptionexploit |
| 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
1 reference
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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
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