CVE-2026-30522Public exploitNetwork attack vector

Financial data corruption via unchecked negative penalty rates

Published Apr 1, 2026 · Updated Apr 1, 2026

Business logic validation failure in SourceCodester Loan Management System 1.0 allows remote authenticated users to create plans with negative penalty rates. The ajax.php?action=save_plan handler accepts a manipulated penalty_rate POST value without repeating the browser's nonnegative-value check. Administrator access is required, and exploitation stores a negative rate that causes overdue-payment calculations to reduce rather than increase the amount due.

CVSS severity6.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Business logic validation failure in SourceCodester Loan Management System 1.0 allows remote authenticated users to create plans with negative penalty rates. The ajax.php?action=save_plan handler accepts a manipulated penalty_rate POST value without repeating the browser's nonnegative-value check. Administrator access is required, and exploitation stores a negative rate that causes overdue-payment calculations to reduce rather than increase the amount due.

The record

CVE
CVE-2026-30522
Published
Apr 1, 2026
Updated
Apr 1, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-602, T1565.001
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-602Client-Side Enforcement of Server-Side Security
T1565.001Stored Data Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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