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CVE-2026-34558

Ci4-cms-erp Ci4ms cross-site scripting (XSS)

9.1 CRITICALPublic exploitEPSS 0.38%
  1. Published30 Mar 2026

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 the Methods Management functionality when creating or managing application methods/pages. Multiple input fields accept attacker-controlled JavaScript payloads that are stored server-side without sanitization or output encoding. These stored values are later rendered directly into administrative interfaces and global navigation components without proper encoding, resulting in Stored DOM-Based Cross-Site Scripting (XSS). This issue has been patched in version 0.31.0.0.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityLow
AvailabilityLow
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< 0.31.0.0

Remediation

Fixed in
Ci4-cms-erp Ci4ms≥ 0.31.0.0

References

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Frequently asked

Is CVE-2026-34558 being actively exploited?

CVE-2026-34558 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.38%.

How severe is CVE-2026-34558?

CVE-2026-34558 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.38% probability of exploitation.

Which products are affected by CVE-2026-34558?

Affected products include Ci4-cms-erp Ci4ms.

How do I fix CVE-2026-34558?

Upgrade affected software to a fixed version, for example Ci4-cms-erp Ci4ms 0.31.0.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-34558 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.