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CVE-2026-30522

Estado: AnalizadaMedia (6.5)—

A Business Logic vulnerability exists in SourceCodester Loan Management System v1.0 due to improper server-side validation. The application allows administrators to create "Loan Plans" with specific penalty rates for overdue payments. While the frontend interface prevents users from entering negative numbers in the "Monthly Overdue Penalty" field, this constraint is not enforced on the backend. An authenticated attacker can bypass the client-side restriction by manipulating the HTTP POST request to submit a negative value for the penalty_rate.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Oretnom23 — Loan Management System

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-30522",
  "cveTags": [],
  "metrics": {
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      {
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          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-04-01T15:37:14.053588Z"
        }
      }
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  "affected": [
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          "versions": [
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              "version": "n/a"
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  "published": "2026-04-01T14:16:50.027",
  "references": [
    {
      "url": "https://github.com/meifukun/Web-Security-PoCs/blob/main/Loan-Management-System/BusinessLogic-LoanPlan-NegativePenalty.md",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "description": [
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          "lang": "en",
          "value": "CWE-602"
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  "descriptions": [
    {
      "lang": "en",
      "value": "A Business Logic vulnerability exists in SourceCodester Loan Management System v1.0 due to improper server-side validation. The application allows administrators to create \"Loan Plans\" with specific penalty rates for overdue payments. While the frontend interface prevents users from entering negative numbers in the \"Monthly Overdue Penalty\" field, this constraint is not enforced on the backend. An authenticated attacker can bypass the client-side restriction by manipulating the HTTP POST request to submit a negative value for the penalty_rate."
    }
  ],
  "lastModified": "2026-06-17T10:32:43.467",
  "configurations": [
    {
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        {
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          "cpeMatch": [
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