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CVE-2026-82033: DeepSeek Harness Missing Authentication Vulnerability

CVE-2026-82033 explained: high Missing Authentication in DeepSeek Harness. CVSS 8.6. Affected versions, detection, fixes and CTEM priority.

Last updated: Nov 4, 2026

CVSS
8.6 HIGH
EPSS
n/a
CISA KEV
Not listed
CWE
CWE-306

Sources: National Vulnerability Database, CVE.org, CISA KEV, FIRST EPSS

CVE-2026-82033 Overview

DeepSeek Harness prior to 0.1.2-alpha.2, and specifically commit 3e24087, contains a missing authentication vulnerability in its web profile HTTP and WebSocket RPC control plane, allowing any local process, including those running as a different OS user, to reach unauthenticated session methods such as session.create and session.prompt. Attackers can invoke session.prompt to trigger the agent's bash and filesystem tools, achieve arbitrary command execution as the victim user using their configured model credentials, intercept live session traffic and logs over the event mux stream, and bypass human tool-approval checks via POST /api/respond by matching only rpcId, approvalId, and sessionId values broadcast over the ungated stream.

Critical Impact

Local or adjacent, unauthenticated attackers can exploit this Missing Authentication in DeepSeek Harness. The CVSS base score is 8.6 (High).

Affected Products

  • DeepSeek Harness: see the vendor advisory for the exact affected versions

Discovery Timeline

  • 2026-11-04: CVE-2026-82033 published to the National Vulnerability Database by disclosure@vulncheck.com
  • 2026-11-04: last updated in the NVD database

Technical Details for CVE-2026-82033

Vulnerability Analysis

CVE-2026-82033 is a Missing Authentication weakness (CWE-306: Missing Authentication) in DeepSeek Harness. Based on its CVSS vector, the flaw needs local or adjacent access, needs no login, and needs no user interaction. A critical function can be used without logging in.

With a CVSS base score of 8.6, apply the vendor fix and confirm exposure on internet facing and business critical assets first.

Root Cause

The weakness is classified as CWE-306: Missing Authentication. A critical function can be used without logging in.

Attack Vector

Based on the CVSS vector, the flaw needs local or adjacent access, needs no login, and needs no user interaction. Attack complexity is low complexity.

No exploitation in the wild is confirmed by CISA at the time of the last update. Check the references below for any vendor or researcher proof of concept.

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Detection Methods for CVE-2026-82033

Detection Strategies

  • Inventory every instance of DeepSeek Harness and compare the running version with the affected range above.
  • Check external attack surface scans for internet facing instances of the component.
  • Run an authenticated vulnerability scan once your scanner ships a check for this CVE.

Monitoring Recommendations

  • Forward DeepSeek Harness application, access and audit logs to your SIEM for retrospective hunting.
  • Alert on new processes, configuration changes or outbound connections from the affected service.
  • Track the vendor advisory and the CISA KEV catalog for changes in exploitation status.

How to Mitigate CVE-2026-82033

Immediate Actions Required

  • Apply the fixed version of DeepSeek Harness named in the vendor advisory.
  • Prioritize internet facing and business critical instances first.
  • Rescan after the change to confirm the exposure is closed.

Patch Information

Use the fixed version listed in the vendor advisory for DeepSeek Harness.

Workarounds

  • If patching must wait, restrict network access to the affected service and place it behind authentication or a web application firewall rule.

CWE References

Technical References

This entry is built directly from NVD, CISA KEV and EPSS data. Verify fixed versions in the vendor advisory before you deploy.

Frequently asked questions

CVE-2026-82033 is a high severity Missing Authentication in DeepSeek Harness with a CVSS score of 8.6. Apply the vendor fix and confirm exposure on internet facing and business critical assets first.

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