CVE-2026-30523: A Business Logic vulnerability exists in SourceCodester Loan Management System v1.0 due to the lack of proper

Routine

MEDIUM 6.5DOWNGRADE

CVE-2026-30523 is a medium-severity flaw (CVSS 6.5) affecting loan management system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 pl

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Weakness	CWE-20
Published	2026-04-01
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: oretnom23

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-01 15:22 UTCPublished CVE record published
2026-06-17 10:32 UTCUpdated Record last modified

oretnom23 loan management system DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

apt-cache policy loan-management-system || rpm -q loan-management-system || loan-management-system --version

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison loan-management-system sudo apt install loan-management-system=<VERSION_BEFORE_1.0> sudo apt-mark hold loan-management-system

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list loan-management-system sudo dnf downgrade loan-management-system-<VERSION_BEFORE_1.0> sudo dnf versionlock add loan-management-system

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-30523?

loan management system: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-30523 being exploited?

CVE-2026-30523 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-30523 affect?

CVE-2026-30523 affects loan management system. Severity is medium (CVSS 6.5). 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).

How urgent is CVE-2026-30523?

Priority 33/100. Public exploit reference

Related CVEs

CVE-2026-30522 MEDIUM 6.5 DOWNGRADE A Business Logic vulnerability exists in SourceCodester Loan Management System v1.0 due to improper server-sid

References

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