CVE-2026-30521
MEDIUMDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Exploit Intelligence
Low risk: more likely to be exploited than 24% of all known CVEs.
References
Related Vulnerabilities
Other CWE-602 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2020-8162 | High | 7.5 | 3.0% | - | Fix |
| CVE-2024-23666 | High | 7.5 | 2.7% | - | Fix |
| CVE-2014-2374 | High | 7.5 | 1.9% | - | - |
| CVE-2014-2373 | High | 7.5 | 1.8% | - | - |
| CVE-2020-24683 | Critical | 9.8 | 1.5% | - | - |
| CVE-2017-14013 | Medium | 5.6 | 1.4% | - | - |
Common questions
How do I fix CVE-2026-30521?
No published fix for CVE-2026-30521 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-30521 being actively exploited?
Not that we know of. CVE-2026-30521 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.31% is the estimated probability that it will be exploited in the next 30 days. That is higher than 24% of all scored CVEs.
How severe is CVE-2026-30521?
CVE-2026-30521 has a CVSS v3 base score of 6.5, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
Embed a live status badge for CVE-2026-30521
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-24.