CVE-2026-34989: CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC a

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CRITICAL 9.0UPGRADE

CVE-2026-34989 is a critical-severity flaw (CVSS 9.0) affecting ci4ms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. Prior to 31.0.0.0, the application fails to properly sanitize user-controlled input when users update their profile name (e.g., full name / username). An attacker can inject a malicious JavaScript payload into their profile name, which is then stored server-side. This stored payload is later rendered unsafe

Why this priority

Critical severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	9.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.4% (top 62%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-04-06
Last modified	2026-10-23

Publisher (CNA): GitHub, Inc. · Vendor: ci4-cms-erp

Am I affected?

Timeline

2026-04-06 17:17 UTCPublished CVE record published
2026-10-23 23:10 UTCUpdated Record last modified

ci4-cms-erp ci4ms UPGRADE

Affected: < 0.31.0.0

Fixed in: 0.31.0.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ci4ms || rpm -q ci4ms || ci4ms --version

2. UPGRADE to 0.31.0.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ci4ms

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ci4ms

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Composer (PHP) · ci4-cms-erp/ci4ms · FIXED · 31.0.0.0 · vulnerable: <= 0.28.6.0 · source

composer require "ci4-cms-erp/ci4ms:>=31.0.0.0"

Fedora 46 · rubygem-eventmachine · FIXED · 1.2.7-37.fc46 · FEDORA-2026-7194c202a2 · source

sudo dnf upgrade --advisory=FEDORA-2026-7194c202a2

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-34989?

ci4ms: upgrade to 0.31.0.0. Exact commands for each OS are on this page.

Is CVE-2026-34989 being exploited?

CVE-2026-34989 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-34989 affect?

CVE-2026-34989 affects ci4ms. Severity is critical (CVSS 9.0). CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. Prior to 31.0.0.0, the application fails to properly sanitize user-controlled input when users upd

How urgent is CVE-2026-34989?

Priority 46/100. Critical severity; Public exploit reference

Related CVEs

CVE-2026-35035 HIGH 7.2 UPGRADE CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC a

References

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