CVE-2026-34561 CI4MS: System Settings (Social Media Management) Full Platform Compromise & Full Account Takeover for All-Roles & Privilege-Escalation via Stored DOM XSS

Medium 4.7 Published 1 Apr 2026 Updated 2 Apr 2026

Attackers can execute stored DOM XSS in CI4MS social media settings to achieve full platform compromise and account takeover for all roles.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2026-34561?

CVE-2026-34561 is a medium-severity cross-site scripting vulnerability in ci4-cms-erp ci4ms, published on 1 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.

Official 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 System Settings – Social Media Management. Multiple configuration fields, including Social Media and Social Media Link, accept attacker-controlled input that is stored server-side and later rendered without proper output encoding. This issue has been patched in version 0.31.0.0.

Weakness: CWE-79

Which versions are affected by CVE-2026-34561?

2 open source packages ship an affected version, including ci4-cms-erp/ci4ms. It affects 1 product.

Package	Affected	Fixed in
`ci4-cms-erp/ci4ms` Packagist	All versions	`0.31.0.0`
`ci4-cms-erp/ci4ms` Packagist	All versions	`0.31.0.0`

Products include Ci4-Cms-Erp Ci4ms.

How do I fix CVE-2026-34561?

Upgrade ci4-cms-erp/ci4ms to 0.31.0.0 or later.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2026-34561 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-34561 exists.

Sources

Also known as GHSA-gcfj-cf7j-vwgj.