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.

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History

Tue, 08 Sep 2026 17:15:00 +0000

Type Values Removed Values Added
Description 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.
Title DeepSeek Harness < 0.1.2-alpha.1 Authentication Bypass via Host Header Spoofing
Weaknesses CWE-807
References
Metrics cvssV3_1

{'score': 9.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.4, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-08T17:21:11.199Z

Reserved: 2026-08-29T17:20:57.082Z

Link: CVE-2026-82533

cve-icon Vulnrichment

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cve-icon NVD

Status : Deferred

Published: 2026-09-08T17:18:36.887

Modified: 2026-09-08T19:53:13.400

Link: CVE-2026-82533

cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses