TI-2026-23543 Aliases CVE-2026-30521 GHSA-pmwx-37w8-6v99

A Business Logic vulnerability exists in SourceCodester Loan Management System v1.0 due…

MEDIUM 62CWE-602Published 2026-03-31 · Updated 2026-04-02

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · High · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.

Summary

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 interest rates. While the frontend interface prevents users from entering negative numbers, 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 interest_percentage. This results in the creation of loan plans with negative interest rates.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00325 25th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:oretnom23:loan_management_system:1.0:::::::*	1.0	Vulnerable	oretnom23

cpe:2.3:a:oretnom23:loan_management_system:1.0:*:*:*:*:*:*:* Versions 1.0 Vulnerable ·oretnom23

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-30521
2026-10-03 Alias added: GHSA-pmwx-37w8-6v99

References

Exploit 1

https://github.com/meifukun/Web-Security-PoCs/blob/main/Loan-Management-System/BusinessLogic-LoanPlan-NegativeInterest.md

TI-2026-23545 A Business Logic vulnerability exists in SourceCodester Loan Management System v1.0 due… CVSS 3.1MEDIUM 6.5
TI-2026-23544 A Business Logic vulnerability exists in SourceCodester Loan Management System v1.0 due… CVSS 3.1MEDIUM 6.5
TI-2026-03194 SourceCodester Loan Management System index.php cross site scripting CVSS 4.0MEDIUM 5.3
TI-2026-23542 A Blind SQL Injection vulnerability exists in SourceCodester Loan Management System v1.0. CVSS 3.1MEDIUM 5.4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences