Which versions of Openharness are affected by EUVD-2026-19746?

OpenHarness versions prior to commit 166fcfe contain an access control flaw that allows authenticated local users to read sensitive files (credentials, SSH keys, configuration data) and write files…. A patch is available.

Openharness EUVD-2026-19746

Q: What is the CVSS score of EUVD-2026-19746?

EUVD-2026-19746 has a CVSS 4.0 base score of 8.4 (High). CVSS vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/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. EPSS exploitation probability: 0.0%.

Q: How to fix or mitigate EUVD-2026-19746?

Within 24 hours: Identify all OpenHarness deployments and current versions in your environment. Within 7 days: Apply the upstream fix from commit 166fcfe or later; verify your vendor has released a stable patched version and validate the fix addresses all four affected tools (read_file, write_file, edit_file, notebook_edit). Within 30 days: Audit logs for unauthorized file access/writes by local authenticated users; rotate any credentials or SSH keys that may have been exposed; review agent tool execution policies to restrict local user permissions until patching is confirmed complete.

| CVE-2026-22682 HIGH

Incorrect Authorization (CWE-863)

2026-04-07 VulnCheck

GHSA-43rx-99w7-v5fh

Authentication Bypass Openharness

8.4

CVSS 4.0 · Vendor: VulnCheck

Severity by source

Vendor (VulnCheck) PRIMARY

8.4 HIGH

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/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

Primary rating from Vendor (VulnCheck) · only source for this CVE.

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/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

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Lifecycle Timeline

Re-analysis Queued

Apr 16, 2026 - 16:22 vuln.today

cvss_changed

EUVD ID Assigned

Apr 07, 2026 - 18:00 euvd

EUVD-2026-19746

Analysis Generated

Apr 07, 2026 - 18:00 vuln.today

Patch released

Apr 07, 2026 - 18:00 nvd

Patch available

CVE Published

Apr 07, 2026 - 17:09 nvd

HIGH 8.4

DescriptionCVE.org

OpenHarness prior to commit 166fcfe contains an improper access control vulnerability in built-in file tools due to inconsistent parameter handling in permission enforcement, allowing attackers who can influence agent tool execution to read arbitrary local files outside the intended repository scope. Attackers can exploit the path parameter not being passed to the PermissionChecker in read_file, write_file, edit_file, and notebook_edit tools to bypass deny rules and access sensitive files such as configuration files, credentials, and SSH material, or create and overwrite files in restricted host paths in full_auto mode.

AnalysisAI

Improper access control in OpenHarness (prior to commit 166fcfe) allows local authenticated attackers with influence over agent tool execution to read arbitrary local files and write/overwrite files outside intended repository boundaries. The vulnerability stems from inconsistent parameter handling where the path parameter is not passed to PermissionChecker in four file operation tools (read_file, write_file, edit_file, notebook_edit), enabling bypass of deny rules to access sensitive credentials, SSH keys, and configuration files. Upstream fix available (PR/commit); released patched version not independently confirmed. EPSS data not available; no public exploit identified at time of analysis.

Technical ContextAI

OpenHarness is an AI agent development framework (HKUDS project) that provides file manipulation tools with permission enforcement mechanisms. The vulnerability exists in the built-in file tools layer where a PermissionChecker component is intended to validate file access against repository scope restrictions. The root cause (CWE-863: Incorrect Authorization) manifests as inconsistent authorization enforcement - while permission checks exist, the critical 'path' parameter required for proper access control validation is omitted when invoking PermissionChecker in four distinct file operation functions. This architectural flaw creates a parameter binding mismatch where the authorization decision is made without knowledge of the actual target path, rendering deny rules ineffective. In full_auto mode, this extends to file creation and overwriting capabilities, amplifying the authorization bypass from read-only to read-write scope violations across the host filesystem.

RemediationAI

Organizations should immediately upgrade to OpenHarness commit 166fcfefb7614dbac51bd061f56542725b0298e9 or later, which addresses the parameter handling inconsistency by ensuring the path parameter is correctly passed to PermissionChecker across all four affected file tools. The patch is available through GitHub pull request #32 (https://github.com/HKUDS/OpenHarness/pull/32) with the specific fix commit at https://github.com/HKUDS/OpenHarness/commit/166fcfefb7614dbac51bd061f56542725b0298e9. Until patching is complete, organizations should implement compensating controls including restricting which users can influence agent tool execution, implementing additional filesystem-level access controls through OS permissions or containerization boundaries, disabling full_auto mode if write capabilities are not essential, and monitoring file access patterns for suspicious out-of-scope operations. Detailed vulnerability analysis is available in the VulnCheck advisory at https://www.vulncheck.com/advisories/openharness-improper-access-control-via-file-tools.