CVE-2026-34560: CI4MS: Logs Full Account Takeover for All-Roles & Privilege-Escalation via Stored DOM XSS

Severity: critical (CVSS 9.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-04-01 · updated 2026-10-26
Weakness: CWE-79

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 renders user-controlled input unsafely within the logs interface. If any stored XSS payload exists within logged data, it is rendered without proper output encoding. This issue becomes a Blind XSS scenario because the attacker does not see immediate execution. Instead, the payload is stored within application logs and only executes later when an administrator views the logs page. This issue has been patched in version 0.31.0.0.

Affected products

ci4-cms-erp ci4ms: before 0.31.0.0 — fixed in 0.31.0.0

How to fix

Upgrade to a fixed version: ci4-cms-erp ci4ms 0.31.0.0. Check the vendor advisory for mitigations.

References

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