How severe is CVE-2026-27599?

CVE-2026-27599 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2026-27599 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-27599?

CVE-2026-27599 affects Ci4-cms-erp Ci4ms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-27599?

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

Does CVE-2026-27599 have an EU (EUVD) identifier?

Yes. CVE-2026-27599 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17199.

When was CVE-2026-27599 published?

CVE-2026-27599 was published on 2026-03-30 and last updated on 2026-06-17.

CVE-2026-27599

CVE-2026-27599 is a medium-severity vulnerability in Ci4-cms-erp Ci4ms with a CVSS 3.x base score of 4.7. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 4.7)
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17199
Weakness: CWE-79
Affected product: Ci4-cms-erp Ci4ms
Published: 2026-03-30
Last modified: 2026-06-17

Description

CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. Prior to version 0.31.0.0, the application fails to properly sanitize user-controlled input within System Settings – Mail Settings. Several configuration fields, including Mail Server, Mail Port, Email Address, Email Password, Mail Protocol, and TLS settings, accept attacker-controlled input that is stored server-side and later rendered without proper output encoding. This issue has been patched in version 0.31.0.0.

Frequently asked questions

What is CVE-2026-27599?: CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. Prior to version 0.31.0.0, the application fails to properly sanitize user-controlled input within System Settings – Mail Settings. Several configuration fields, including Mail Server, Mail Port, Email Address, Email Password, Mail Protocol, and TLS settings, accept attacker-controlled input that is stored server-side and later rendered without proper output encoding. This issue has been patched in version 0.31.0.0.
How severe is CVE-2026-27599?: CVE-2026-27599 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2026-27599 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-27599?: CVE-2026-27599 affects Ci4-cms-erp Ci4ms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-27599?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-27599 have an EU (EUVD) identifier?: Yes. CVE-2026-27599 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17199.
When was CVE-2026-27599 published?: CVE-2026-27599 was published on 2026-03-30 and last updated on 2026-06-17.

References

https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-66m2-v9v9-95c3

Affected products (1)

cpe:2.3:a:ci4-cms-erp:ci4ms:*:*:*:*:*:*:*:*

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