CVE-2026-40043

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{"affected": [{"affectedData": [{"product": "Pachno", "vendor": "pancho", "versions": [{"status": "affected", "version": "1.0.6"}]}], "source": "disclosure@vulncheck.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Pachno 1.0.6 contains an authentication bypass vulnerability in the runSwitchUser() action that allows authenticated low-privilege users to escalate privileges by manipulating the original_username cookie. Attackers can set the client-controlled original_username cookie to any value and request a switch to user ID 1 to obtain session tokens or password hashes belonging to administrator accounts."}, {"lang": "es", "value": "Pachno 1.0.6 contiene una vulnerabilidad de omisi\u00f3n de autenticaci\u00f3n en la acci\u00f3n runSwitchUser() que permite a usuarios autenticados de bajo privilegio escalar privilegios manipulando la cookie original_username. Los atacantes pueden establecer la cookie original_username controlada por el cliente a cualquier valor y solicitar un switch al ID de usuario 1 para obtener tokens de sesi\u00f3n o hashes de contrase\u00f1a pertenecientes a cuentas de administrador."}], "id": "CVE-2026-40043", "lastModified": "2026-10-26T22:10:00.163", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "disclosure@vulncheck.com", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "disclosure@vulncheck.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-40043", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-04-13T20:49:56.370304Z", "version": "2.0.3"}}]}, "published": "2026-04-13T19:16:52.140", "references": [{"source": "disclosure@vulncheck.com", "url": "https://www.vulncheck.com/advisories/pachno-authentication-bypass-via-runswitchuser"}, {"source": "disclosure@vulncheck.com", "url": "https://www.zeroscience.mk/en/vulnerabilities/ZSL-2026-5985.php"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://www.zeroscience.mk/#/advisories/ZSL-2026-5985"}], "sourceIdentifier": "disclosure@vulncheck.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-639"}], "source": "disclosure@vulncheck.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "1.0.6"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "pachno", "vendor": "pachno"}], "analysis": {"en": {"generated_at": "2026-04-13T19:50:50.313275+00:00", "value": {"mitigation_remediation": ["Apply the vendor\u2019s latest Pachno update to patch the authentication bypass.", "If a patch is not immediately available, restrict or disable the runSwitchUser feature so that only administrators can use it.", "Monitor authentication logs for suspicious switch\u2011user requests or anomalous changes to the original_username cookie."], "summary": {"action": "Immediate Patch", "impact": "Privilege Escalation"}, "threat_synthesis": {"affected_systems": "The vulnerability affects only installations of Pachno 1.0.6 on any supported platform. Users of newer or older releases are not impacted. It arises in the specific Pacno release and does not carry over to subsequent versions unless the underlying runSwitchUser logic is unchanged.", "description_and_impact": "A flaw in Pachno version 1.0.6 allows low\u2011privilege users to bypass authentication by manipulating the original_username cookie in the runSwitchUser() action. When an attacker sets this cookie to any value and requests a switch to user ID 1, the system grants access to session tokens or password hashes belonging to the administrator account. The weakness corresponds to CWE\u2011639, which represents unauthorized credential escalation.", "risk_and_exploitability": "The CVSS score of 7.1 marks it as high severity. No EPSS data is available, and the flaw has not been added to the CISA KEV catalog. An attacker only needs to be authenticated with a low\u2011privilege account to alter the client\u2011controlled original_username cookie and request a switch to the administrator user. The attack requires no additional privileges beyond the initial authenticated session, making exploitation straightforward once the cookie is manipulated."}}}}, "created": "2026-04-14T16:18:29.991424+00:00", "updated": "2026-04-14T16:33:37.514873+00:00", "vendors": ["pachno", "pachno$PRODUCT$pachno"]}