How severe is CVE-2026-109406?

CVE-2026-109406 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability low.

Is CVE-2026-109406 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-109406?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-109406 published?

CVE-2026-109406 was published on 2026-10-13 and last updated on 2026-10-14.

CVE-2026-109406

CVE-2026-109406 is a medium-severity vulnerability with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-840.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v2: 5.5
CVSS v4: 5.3
EPSS exploit prediction: 0% (16th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-840
Published: 2026-10-13
Last modified: 2026-10-14

Description

A weakness has been identified in macrozheng mall up to 1.0.3. This vulnerability affects the function OmsPortalOrderServiceImpl of the file /order/generateOrder of the component mall-portal. This manipulation of the argument coupon_amount/pay_amount causes business logic errors. The attack is possible to be carried out remotely. The vendor deleted the GitHub issue for this vulnerability without any explanation.

Frequently asked questions

What is CVE-2026-109406?: A weakness has been identified in macrozheng mall up to 1.0.3. This vulnerability affects the function OmsPortalOrderServiceImpl of the file /order/generateOrder of the component mall-portal. This manipulation of the argument coupon_amount/pay_amount causes business logic errors. The attack is possible to be carried out remotely. The vendor deleted the GitHub issue for this vulnerability without any explanation.
How severe is CVE-2026-109406?: CVE-2026-109406 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability low.
Is CVE-2026-109406 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-109406?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-109406 published?: CVE-2026-109406 was published on 2026-10-13 and last updated on 2026-10-14.

References

Other CWE-840 vulnerabilities

CVE-2022-4719 — Critical (CVSS 9.8): Business Logic Errors in GitHub repository ikus060/rdiffweb prior to 2.5.5.
CVE-2022-3363 — Critical (CVSS 9.8): Business Logic Errors in GitHub repository ikus060/rdiffweb prior to 2.5.0a7.
CVE-2021-4171 — Critical (CVSS 9.8): calibre-web is vulnerable to Business Logic Errors
CVE-2024-39671 — Critical (CVSS 9.3): Access control vulnerability in the security verification module. Impact: Successful exploitation of this vulnerability…
CVE-2024-54098 — High (CVSS 8.5): Service logic error vulnerability in the system service module Impact: Successful exploitation of this vulnerability…
CVE-2026-58558 — High (CVSS 7.8): Permission control vulnerability in the file system. Impact: Successful exploitation of this vulnerability may affect…

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