CVE-2026-34558
Stored DOM XSS in CI4MS Methods Management Component
Publication date: 2026-03-30
Last updated on: 2026-04-06
Assigner: GitHub, Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| ci4-cms-erp | ci4ms | to 0.31.0.0 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-79 | The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. |
Attack-Flow Graph
AI Powered Q&A
What immediate steps should I take to mitigate this vulnerability?
The vulnerability is caused by improper sanitization of user-controlled input in the Methods Management functionality of CI4MS prior to version 0.31.0.0.
To mitigate this vulnerability immediately, you should upgrade the CI4MS application to version 0.31.0.0 or later, where the issue has been patched.
Can you explain this vulnerability to me?
This vulnerability exists in CI4MS, a CodeIgniter 4-based CMS skeleton, prior to version 0.31.0.0. The issue arises because the application does not properly sanitize user-controlled input within the Methods Management functionality when creating or managing application methods or pages.
Multiple input fields accept attacker-controlled JavaScript payloads that are stored on the server without sanitization or output encoding. These stored malicious values are later rendered directly into administrative interfaces and global navigation components without proper encoding.
As a result, this leads to Stored DOM-Based Cross-Site Scripting (XSS), where malicious scripts can execute in the context of the administrative user’s browser.
How can this vulnerability impact me? :
This vulnerability can have serious impacts including unauthorized script execution within the administrative interface of the application.
An attacker can inject malicious JavaScript that executes in the context of an administrator's browser, potentially leading to theft of sensitive information, session hijacking, or unauthorized actions performed with administrative privileges.
The CVSS score of 9.1 indicates a high severity, with impacts on confidentiality, integrity, and availability.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
The vulnerability allows attacker-controlled JavaScript payloads to be stored and rendered without proper sanitization or encoding, leading to Stored DOM-Based Cross-Site Scripting (XSS). This can result in unauthorized access or manipulation of administrative interfaces and global navigation components.
Such security weaknesses can impact compliance with common standards and regulations like GDPR and HIPAA, which require protection of personal data and secure application behavior to prevent unauthorized access or data breaches.
However, the provided information does not explicitly describe the direct impact on compliance with these standards.