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TI-2026-26819 Aliases CVE-2026-34570GHSA-4vxv-4xq4-p84h

Improper access control in ci4-cms-erp ci4ms

Priority HIGH 79CWE-1254Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-284.

Summary

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 immediately revoke active user sessions when an account is deleted. Due to a logic flaw in the backend design, account state changes are enforced only during authentication (login), not for already-established sessions. The system implicitly assumes that authenticated users remain trusted for the lifetime of their session. There is no session expiration or account expiration mechanism in place, causing deleted accounts to retain indefinite access until the user manually logs out. This behavior breaks the intended access control policy and results in persistent unauthorized access. This issue has been patched in version 0.31.0.0.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00511 43rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed ci4ms (ci4-cms-erp): 0.31.0.0ci4-cms-erp/ci4ms (Packagist): 0.31.0.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ci4-cms-erpci4msbefore 0.31.0.00.31.0.0Patch availableCNA
—ci4-cms-erp/ci4ms (Packagist)before 0.31.0.00.31.0.0Patch availableGHSA-4vxv-4xq4-p84h
  • ci4ms Vendorci4-cms-erp Affected before 0.31.0.0 Fixed in 0.31.0.0 Patch available CNA
  • ci4-cms-erp/ci4ms (Packagist) Vendor— Affected before 0.31.0.0 Fixed in 0.31.0.0 Patch available GHSA-4vxv-4xq4-p84h

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:ci4-cms-erp:ci4ms:*:*:*:*:*:*:*:*before 0.31.0.0Vulnerableci4-cms-erp
  • cpe:2.3:a:ci4-cms-erp:ci4ms:*:*:*:*:*:*:*:* Versions before 0.31.0.0 Vulnerable ·ci4-cms-erp

Remediation

  • Fix · CNA ci4ms (ci4-cms-erp) Fixed in 0.31.0.0
  • Fix · GHSA-4vxv-4xq4-p84h ci4-cms-erp/ci4ms (Packagist) Fixed in 0.31.0.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-34570
  2. 2026-10-03 Alias added: GHSA-4vxv-4xq4-p84h
  3. 2026-10-14 EPSS moved to the 50th–90th percentile
  4. 2026-10-25 EPSS moved to the below the 50th percentile

References

Exploit 1

Advisory 1

Other 2

  • TI-2026-28379 CI4MS has an .env CRLF Injection via Unvalidated `host` Parameter in Install Controller CVSS 3.1CRITICAL 9.8
  • TI-2026-27211 Cross-site scripting in ci4-cms-erp ci4ms CVSS 4.0CRITICAL 9.4
  • TI-2026-26820 Cross-site scripting in ci4-cms-erp ci4ms CVSS 3.1CRITICAL 10.0
  • TI-2026-26818 CI4MS: Blogs Categories Full Account Takeover for All-Roles & Privilege-Escalation via Stored DOM XSS CVSS 3.1CRITICAL 10.0
  • TI-2026-27238 Cross-site scripting in ci4-cms-erp ci4ms CVSS 3.1CRITICAL 9.0
  • TI-2026-26821 Improper access control in ci4-cms-erp ci4ms CVSS 3.1HIGH 8.8
See all 26 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences