CVE-2026-30523

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{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:oretnom23:loan_management_system:1.0:*:*:*:*:*:*:*", "matchCriteriaId": "7902576E-876D-4BE4-8EF6-28B7403B130D", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A Business Logic vulnerability exists in SourceCodester Loan Management System v1.0 due to the lack of proper input validation. The application allows administrators to define \"Loan Plans\" which determine the duration of a loan (in months). However, the backend fails to validate that the duration must be a positive integer. An attacker can submit a negative value for the months parameter. The system accepts this invalid data and creates a loan plan with a negative duration."}, {"lang": "es", "value": "Una vulnerabilidad de l\u00f3gica de negocio existe en SourceCodester Loan Management System v1.0 debido a la falta de validaci\u00f3n de entrada adecuada. La aplicaci\u00f3n permite a los administradores definir \u2019Planes de Pr\u00e9stamo\u2019 que determinan la duraci\u00f3n de un pr\u00e9stamo (en meses). Sin embargo, el backend no valida que la duraci\u00f3n debe ser un entero positivo. Un atacante puede enviar un valor negativo para el par\u00e1metro de meses. El sistema acepta estos datos inv\u00e1lidos y crea un plan de pr\u00e9stamo con una duraci\u00f3n negativa."}], "id": "CVE-2026-30523", "lastModified": "2026-11-11T19:10:00.360", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.2, "impactScore": 5.2, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-30523", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-04-01T17:55:38.667215Z", "version": "2.0.3"}}]}, "published": "2026-04-01T15:22:59.170", "references": [{"source": "cve@mitre.org", "tags": ["Exploit", "Third Party Advisory"], "url": "https://github.com/meifukun/Web-Security-PoCs/blob/main/Loan-Management-System/BusinessLogic-LoanPlan-NegativeMonths.md"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-20"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "1.0"}}], "enrichment": {"confidence": 85.0, "confidence_source": "inferred", "scores": [{"score": 85.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "n/a", "source": "cna", "vendor": "n/a"}, "product": "loan_management_system", "vendor": "sourcecodester"}], "analysis": {"en": {"generated_at": "2026-04-07T19:48:22.410776+00:00", "value": {"mitigation_remediation": ["Synchronize the application code to enforce that the loan duration must be a positive integer before persisting the plan. \"i.e., add input validation in the backend service that rejects or corrects negative values. ", "If an official patch or newer version of SourceCodester Loan Management System that includes this validation is available, upgrade immediately. ", "Restrict administrative access to trusted personnel and monitor account activity for attempts to create loan plans with anomalous parameters. ", "Apply general secure coding best practices, such as implementing server\u2011side validation for all inputs irrespective of client\u2011side checks."], "summary": {"action": "Patch now", "impact": "Business logic flaw permitting creation of loan plans with negative durations that may lead to perpetual or otherwise abused financial products"}, "threat_synthesis": {"affected_systems": "The SourceCodester Loan Management System, version 1.0, is vulnerable. No other vendor or product versions are mentioned, and the vulnerability is specific to this application stack.", "description_and_impact": "The system allows administrators to configure loan plans solely by specifying a duration in months, but the backend omits validation that this value must be a positive integer. An attacker who can submit an administrative request can send a negative months value; the system stores this invalid plan and accepts it as a legitimate loan schedule. Because the loan duration can become negative, it may effectively grant a loan that never matures or otherwise distort financial reporting and risk exposure, constituting an exploitable business logic error.", "risk_and_exploitability": "With a CVSS score of 6.5, the flaw is considered moderate in severity. The EPSS score is below 1\u202f%, indicating that widespread exploitation is unlikely at present, and the vulnerability is not yet listed in CISA's KEV catalog. Because the flaw requires an administrative context to create a loan plan, the attack vector is likely \u201clocal\u201d or \u201cauthenticated\u201d rather than remote. An attacker who can force the months parameter to a negative number can create loan plans that may never expire or otherwise misrepresent loan terms, potentially enabling financial abuse. No publicly disclosed exploits exist, but the low exploitation probability does not eliminate the need to address the underlying input validation bug."}}}}, "created": "2026-04-02T07:51:19.258165+00:00", "updated": "2026-04-08T20:00:00.791390+00:00", "vendors": ["sourcecodester", "sourcecodester$PRODUCT$loan_management_system"]}