What is CVE-2026-34559?

CVE-2026-34559 is a critical-severity vulnerability in Ci4-cms-erp Ci4ms, classified under Cross-site Scripting. CVSS score: 9.1/10. Published 2026-04-01.

How severe is CVE-2026-34559?

Critical severity. CVSS v3 base score is 9.1 out of 10.

XSS in Ci4-cms-erp Ci4ms

CVE-2026-34559

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 when…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.003 (24.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L.

Affected products

Ci4-cms-erp Ci4ms — versions < 0.31.0.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
security-advisories@github.com (x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-34559?: CVE-2026-34559 is a critical-severity vulnerability in Ci4-cms-erp Ci4ms, classified under Cross-site Scripting. CVSS score: 9.1/10. Published 2026-04-01.
How severe is CVE-2026-34559?: Critical severity. CVSS v3 base score is 9.1 out of 10.