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.
CVE-2026-27599
MEDIUMNVD 4.74.7—Elevated
EchelonGraph scoreMEDIUM confidence
This medium-severity CVE scores 4.7 under NVD CVSS v3. EPSS exploit probability: 0.0%, top 89% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, nvd
4.7
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.7Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 4.7
- EG Score
- 4.7(medium)
- EPSS
- 27.9%
- KEV
- Not listed
Published
March 30, 2026
Last Modified
April 6, 2026
References (1)
- security-advisories@githubhttps://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-66m2-v9v9-95c3
Affected Packages
(1 across 1 ecosystem)
Packagist(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| ci4-cms-erp/ci4ms | 0.21.0 ... 0.28.6.0 (47 versions) | 0.31.0.0 | — |
Frequently asked(5)
What is CVE-2026-27599?
CVE-2026-27599 is a medium vulnerability published on March 30, 2026. 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…
When was CVE-2026-27599 disclosed?
CVE-2026-27599 was first published in the National Vulnerability Database on March 30, 2026, with the most recent update on April 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-27599 actively exploited?
CVE-2026-27599 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 27.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-27599?
CVE-2026-27599 has a CVSS v3 base score of 4.7 (NVD).
How do I remediate CVE-2026-27599?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-27599, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-27599
Is Your Infrastructure Affected by CVE-2026-27599?
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