CVE-2026-27599 ci4-cms-erp/ci4ms: System Settings (Mail Settings) Full Platform Compromise & Full Account Takeover for All-Roles & Privilege-Escalation via Stored DOM XSS
Attackers can inject malicious scripts into Mail Settings to achieve full platform compromise and account takeover via stored DOM XSS.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-27599?
CVE-2026-27599 is a medium-severity cross-site scripting vulnerability in ci4-cms-erp ci4ms, published on 30 Mar 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 – Mail Settings. Several configuration fields, including Mail Server, Mail Port, Email Address, Email Password, Mail Protocol, and TLS settings, 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-2026-27599?
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-2026-27599?
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-2026-27599 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-27599 exists.
Other vulnerabilities in ci4-cms-erp ci4ms
- CVE-2026-34569 CI4MS: Blogs Categories Full Account Takeover for All-Roles & Privilege-Escalation via Stored DOM XSS
- CVE-2026-34571 CI4MS: Stored Cross‑Site Scripting (Stored XSS) in Backend User Management Allows Session Hijacking and Full Administrative Account Compromise
- CVE-2026-25510 CI4MS Vulnerable to Remote Code Execution (RCE) via Arbitrary File Creation and Save in File Editor
- CVE-2026-34989 CI4MS: Profile & User Management Full Account Takeover for All-Roles & Privilege-Escalation via Stored DOM XSS
- CVE-2026-34559 CI4MS: Blogs Tags Full Account Takeover for All-Roles & Privilege-Escalation via Stored DOM XSS
Sources
Also known as GHSA-66m2-v9v9-95c3.