CVE-2026-6823Public exploitNetwork attack vector

Unauthorized host file access via wildcard channel allowlist

Published Apr 21, 2026 · Updated Apr 21, 2026

Insecure default permissions in HKUDS OpenHarness before 0.1.7 allow remote attackers to access host-backed agent runtimes. BaseChannelConfig initializes enabled remote channels with a wildcard allow_from list, while the configuration wizard preserves that value and ChannelManager rejects an empty deny-all list. An operator must enable a reachable remote channel; any sender on that channel then passes admission and can invoke default read-only tools to read host files.

CVSS severity8.3
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insecure default permissions in HKUDS OpenHarness before 0.1.7 allow remote attackers to access host-backed agent runtimes. BaseChannelConfig initializes enabled remote channels with a wildcard allow_from list, while the configuration wizard preserves that value and ChannelManager rejects an empty deny-all list. An operator must enable a reachable remote channel; any sender on that channel then passes admission and can invoke default read-only tools to read host files.

The record

CVE
CVE-2026-6823
Published
Apr 21, 2026
Updated
Apr 21, 2026
Vendor
Data Intelligence Lab @ HKU
Product
OpenHarness
Classifications
CWE-276, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <PR #147

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Data Intelligence Lab @ HKU · OpenHarnessversion=0 <PR #147

Published CVSS scores

8.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
8.2VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-276Incorrect Default Permissions
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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