EUVD-2026-18082
GHSA-x7wh-g25g-53vg
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. An attacker can inject a malicious JavaScript payload into blog post content, which is then stored server-side. This stored payload is later rendered unsafely in multiple application views 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 module allows authenticated attackers to inject malicious JavaScript that executes in victims' browsers across multiple application views. The vulnerability affects all versions prior to 0.31.0.0 and stems from insufficient input sanitization when creating or editing blog posts combined with unsafe output rendering. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires authenticated user with blog post creation/editing permissions in CI4MS versions prior to 0.31.0.0. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS base score of 9.1 (Critical) reflects legitimate concerns given the network attack vector (AV:N), low complexity (AC:L), no user interaction requirement (UI:N), and critically the scope change (S:C) indicating the attack can affect resources beyond the vulnerable component's security scope. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with low-privilege blog author credentials authenticates to a CI4MS installation and creates a new blog post. In the post content field, they inject a malicious JavaScript payload such as a session-stealing script that exfiltrates cookies to an attacker-controlled server. … |
| Remediation | Upgrade to CI4MS version 0.31.0.0 or later, which includes patches addressing the input sanitization and output encoding deficiencies. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: identify all CI4MS instances and determine current version numbers; restrict blog post creation/editing permissions to trusted administrators only pending patching. …
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External POC / Exploit Code
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