What is CVE-2026-34558?

CVE-2026-34558 is a critical-severity vulnerability in Ci4-cms-erp Ci4ms, classified under Cross-site Scripting. CVSS score: 9.1/10. Published 2026-03-30.

How severe is CVE-2026-34558?

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

XSS in Ci4-cms-erp Ci4ms

CVE-2026-34558

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 withi…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (6.2th 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

https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-v77r-xg3p-75g7 (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-34558?: CVE-2026-34558 is a critical-severity vulnerability in Ci4-cms-erp Ci4ms, classified under Cross-site Scripting. CVSS score: 9.1/10. Published 2026-03-30.
How severe is CVE-2026-34558?: Critical severity. CVSS v3 base score is 9.1 out of 10.