| 插件名稱 | WooCommerce Infinite Scroll |
|---|---|
| 漏洞類型 | 反序列化漏洞 |
| CVE編號 | CVE-2025-11993 |
| 緊急 | 高的 |
| CVE 發布日期 | 2026-06-01 |
| 來源網址 | CVE-2025-11993 |
Urgent Advisory: CVE-2025-11993 — PHP Object Injection Vulnerability in WooCommerce Infinite Scroll (Versions ≤ 1.8)
日期： June 1, 2026
作者： Managed-WP 安全研究團隊
類別： WordPress Security, WooCommerce, Vulnerabilities
標籤： CVE-2025-11993, Deserialization, PHP Object Injection, WooCommerce, WAF, Incident Response
執行摘要
A critical security flaw identified as CVE-2025-11993 has been disclosed affecting the WooCommerce Infinite Scroll and Ajax Pagination plugin versions 1.8 and below. This vulnerability arises from untrusted PHP object deserialization, enabling authenticated users with as low a permission level as Subscriber to exploit the flaw. Carrying a high CVSS score of 8.8, this exploit is actively exploitable in the wild and poses severe risks including remote code execution, unauthorized privilege escalation, data leaks, and full website takeover.
If your WordPress site uses this plugin, it is imperative to act immediately. This comprehensive report details the nature of the vulnerability, attack vectors, detection techniques, mitigation instructions, and practical WordPress hardening recommendations. Managed-WP also offers guidance on deploying advanced Web Application Firewall (WAF) protections to virtually patch this vulnerability until an official fix is released.
了解漏洞
- 標識符： CVE-2025-11993
- 受影響的插件： WooCommerce Infinite Scroll and Ajax Pagination (≤ 1.8)
- 漏洞類型： PHP Object Injection via Unsafe Deserialization
- 所需存取等級： 認證的訂閱者
- CVSS評分： 8.8 (高)
- 補丁狀態： No official patch available at time of writing
This vulnerability stems from the plugin unserializing PHP objects submitted by authenticated users without adequate validation or sanitization. Attackers with subscriber access can craft malicious serialized objects exploiting PHP magic methods (e.g., __wakeup(), __destruct()) or gadget chains within WordPress core or other installed components. This misbehavior allows arbitrary PHP code execution and privilege escalation.
Why This Vulnerability is a High Threat
Deserialization issues in PHP environments are exceptionally dangerous due to the flexibility of serialized objects. Malicious input can instantiate objects that trigger sensitive internal operations, enabling attackers to:
- Execute arbitrary code remotely, leading to full site compromise.
- Create or escalate user privileges including admin account creation.
- Upload and activate backdoors or web shells undetected.
- Exfiltrate sensitive data such as user accounts, orders, and payment information.
- Deface websites or leverage compromised sites for further attacks.
- Persist in the hosting environment and conduct lateral movement.
Because only subscriber-level authentication is required, attackers can mass-register accounts or use compromised subscriber credentials to mount widespread exploit campaigns.
典型的利用工作流程
- Mass-register subscriber accounts or use compromised credentials.
- Identify vulnerable AJAX or REST endpoints in the plugin that deserialize PHP data.
- Craft serialized payloads embedding malicious PHP objects targeting existing classes with exploitable magic methods.
- Submit payloads via POST requests to the vulnerable endpoints.
- Trigger the execution of malicious code during deserialization.
- Achieve privilege escalation, remote code execution, or site takeover.
The automation of this attack vector makes it scalable and hard to detect without active monitoring.
Detection Strategy: Indicators of Exploitation
Site owners and administrators should monitor for the following signs promptly:
- 異常的 POST 請求
admin-ajax.phpor plugin-specific endpoints from subscriber accounts. - Payloads containing serialized PHP objects, detectable by regex patterns like
O:\d+:或者C:\d+:in request bodies. - Sudden spikes in subscriber account registrations, especially with sequential or suspicious email addresses.
- Unexpected account activity such as password resets, metadata changes, or abnormal purchase data.
- Unauthorized file modifications — particularly PHP files in
wp-content/uploads,wp-content/plugins, or critical core directories. - Unexpected cron jobs or scheduled events that could indicate persistence mechanisms.
- Outbound connections to suspicious IP addresses or domains, if your hosting environment provides network logs.
Example Commands for Sysadmin Use:
# Scan plugin directory for unserialize usage
grep -RIn "unserialize" wp-content/plugins/sb-woocommerce-infinite-scroll || true
# Check access logs for serialized object patterns in POST requests
grep -IEn "O:[0-9]+:\"" /var/log/nginx/access.log* /var/log/apache2/access.log* || true
# Find recently modified files in wp-content
find wp-content -type f -mtime -7 -print
立即採取的緩解措施
- 備份您的網站： Create a full snapshot of files and databases before making any changes.
- 停用插件： If possible, disable WooCommerce Infinite Scroll to prevent exploitation.
- Via WordPress Dashboard: Plugins → deactivate WooCommerce Infinite Scroll
- Via WP-CLI (command line):
wp plugin deactivate sb-woocommerce-infinite-scroll
- Restrict Site Access: If deactivation is not feasible, restrict website access to logged-in users or admins only and disable public registrations temporarily.
- 重設憑證： Force password changes for administrators and suspicious users. Rotate API keys and any critical credentials.
- 掃描是否存在漏洞： Search for web shells or suspicious files and take your site offline if necessary.
- Apply Targeted WAF Rules: Deploy virtual patches to block serialized object payloads and plugin endpoint access.
- 監控活動： Watch logs for exploit attempts, anomalous user behavior, and suspicious scheduled tasks.
建議的 WAF 規則和示例
Deploying a Web Application Firewall (WAF) with custom rules provides critical virtual patching while awaiting official updates. Suggested rules include:
- Block POST request bodies containing serialized PHP objects matching
O:\d+:"模式。. - Block or challenge AJAX and REST API requests to plugin-specific routes from subscriber-level accounts.
- Enforce nonce verification on AJAX calls.
- Rate-limit requests from new or suspicious accounts.
Example ModSecurity Rule for Serialized Object Blocking:
# Block suspicious PHP serialized objects in POST body
SecRule REQUEST_METHOD "POST" "chain,phase:2,deny,log,status:403,id:100001,msg:'Block PHP serialized object in POST body'"
SecRule REQUEST_BODY "(?:O:\s*\d+\s*:|C:\s*\d+\s*:)" "t:none,t:lowercase"
Example Rule for Admin AJAX Abuse:
# Block unserialize attempts in admin-ajax.php or REST requests
SecRule REQUEST_URI "(?:/wp-admin/admin-ajax\.php|/wp-json/)" "chain,phase:2,deny,log,status:403,id:100002,msg:'Block unserialize attempts in AJAX/REST requests'"
SecRule REQUEST_BODY "(?:O:\s*\d+\s*:|C:\s*\d+\s*:)" "t:none"
Example Rule for Plugin-Specific REST Endpoint:
# Block requests to infinite scroll REST endpoints
SecRule REQUEST_URI "/wp-json/sb-infinite-scroll/.*" "phase:2,deny,log,status:403,id:100003,msg:'Block requests to infinite scroll endpoints'"
筆記： Test any WAF rules on staging environments since false positives can disrupt legitimate traffic.
Quick Defensive MU-Plugin for WordPress
As an interim measure, add this MU-plugin to block serialized object payloads in POST requests:
<?php
// wp-content/mu-plugins/block-serialized-objects.php
add_action('init', function() {
if ($_SERVER['REQUEST_METHOD'] !== 'POST') return;
$body = file_get_contents('php://input');
if (!$body) return;
if (preg_match('/O:\s*\d+\s*:|C:\s*\d+\s*:/i', $body)) {
error_log('Blocked suspicious serialized payload from ' . $_SERVER['REMOTE_ADDR']);
wp_die('Suspicious request blocked', 'Blocked', array('response' => 403));
}
}, 1);
- Place the file in
wp-content/mu-plugins/to load before regular plugins. - This is a temporary stop-gap and should be removed once an official patch is applied.
Developer Guidance: Preventing Unsafe Deserialization
- 避免對不受信任的輸入使用 unserialize()： 更喜歡
json_decode()when receiving structured data. - 請使用 PHP 7 或更高版本
反序列化()11. allowed_classes: Limit or disallow deserialization of objects entirely.$data = @unserialize($input, ['allowed_classes' => false]); if ($data === false && $input !== serialize(false)) { // Handle error } - Sanitize and validate input data rigorously before deserialization.
- Enforce capability and nonce checks on AJAX and REST endpoints:
check_ajax_referer('some_nonce', 'security'); if (!current_user_can('required_cap')) { wp_send_json_error('Insufficient privileges', 403); } - Store server-side state in options, transients, or usermeta instead of user-supplied serialized data.
- Implement unit tests simulating malicious deserialization inputs to verify safe handling.
事件響應程序
- Snapshot & Isolate: Take full backups and consider putting the site offline.
- 範圍標識： Analyze logs for suspicious payloads and file changes.
find . -type f -mtime -30 -print - 遏制： Deactivate the vulnerable plugin and restrict access.
Remove suspicious accounts if needed. - 清理： Remove unknown files, reinstall WordPress core/plugins/themes from trusted sources, or revert to a clean backup.
- Reassessment: Rescan for malware and verify integrity.
- 事件後： Rotate secrets, review logs, and implement patch management.
長期安全加固建議
- Apply the principle of least privilege; restrict admin access strictly.
- Enforce strong passwords and 2FA for all admin users.
- 及時更新 WordPress 核心程式、主題和外掛程式。
- Limit use of plugins to reliable and actively maintained packages.
- Implement file-write restrictions (e.g.,
定義（'DISALLOW_FILE_EDIT'，true）；). - Deploy a managed WAF featuring virtual patching and custom rules.
- Regularly monitor logs and set alerts for anomalous activity.
- 定期維護備份並經常測試恢復程序。.
Verify if Your Site is Affected
通過 WP-CLI 檢查已安裝的插件版本：
wp plugin list --format=table | grep sb-woocommerce-infinite-scroll -i
Any version ≤ 1.8 should be treated as vulnerable until patched.
Audit plugin source for unserialize calls:
grep -RIn "unserialize" wp-content/plugins/sb-woocommerce-infinite-scroll || true
Unsafe unserialize use without allowed_classes or validation strongly indicates vulnerability.
Recommendations if You Use a Hosting Provider or Agency
- Notify your host immediately to block suspicious exploit traffic.
- Request immediate virtual patching or custom WAF rules specifically targeting this vulnerability.
- Coordinate with developers to disable or remove the plugin until an official fix is available.
- If managing multiple WordPress installations, treat all as potentially affected until investigation completes.
Incident Response Timeline (Suggested)
- 第 0 小時： Backup, deactivate plugin, restrict registrations, update passwords.
- Hours 1-6: Deploy WAF virtual patch or MU-plugin blocking serialized objects.
- 第一天： Conduct comprehensive malware scan and begin forensic investigation.
- Days 1-3: Search for persistence mechanisms (unknown cron jobs, mu-plugins, backdoors).
- Days 3-7: Clean site or restore from clean backup and resume operations under monitoring.
- 第 1 週及以後： Harden environment and maintain vigilant log monitoring.
Why Patching Alone Is Not Enough
Many sites delay patching for various reasons including staging workflows or workflow bottlenecks. Relying solely on vendor patches leaves windows of exposure. Virtual patching with WAFs, continuous monitoring, and security hardening form critical defense layers to reduce risk from both newly discovered and existing vulnerabilities.
How Managed-WP Supports You During Mitigation
Managed-WP delivers comprehensive WordPress security management including:
- Managed Web Application Firewall with rapid deployment of virtual patches targeting new vulnerabilities like CVE-2025-11993.
- Rulesets designed to detect/block serialization attacks and plugin-specific exploitation patterns.
- File integrity monitoring and scheduled malware scanning.
- Real-time incident alerts integrated with your communication channels.
- Guided step-by-step remediation assistance for site owners and developers.
Utilizing Managed-WP’s security services dramatically reduces reaction time and exposure while awaiting official patches or performing cleanup.
Free Essential Protection with Managed-WP
Every WordPress site needs baseline security—Managed-WP’s free Basic plan offers vital protections including:
- Always updated firewall and WAF protections.
- Unlimited traffic coverage without bandwidth caps.
- Regular malware scanning for suspicious files.
- Defenses against OWASP Top 10 vulnerabilities.
Upgrade anytime to paid plans for automatic malware cleanup, IP management, monthly reporting, and prioritized virtual patching.
Summary: Immediate Action Checklist
- If running WooCommerce Infinite Scroll ≤ 1.8: treat your site as vulnerable and act now.
- 在可行的情況下停用易受攻擊的插件。.
- If unable to deactivate, deploy WAF rules or Managed-WP MU-plugins to block serialization attacks.
- Force password resets for privileged and suspicious users.
- Create backups and initiate forensic analysis.
- Implement Managed-WP’s free Basic security service during patching and recovery.
參考文獻及延伸閱讀
- 官方 CVE 詳情： CVE-2025-11993
- WordPress Developer Handbook: AJAX Security, Nonces, Roles & Capabilities
- PHP Manual: Secure use of
反序列化()and allowed_classes option - OWASP Guidelines: Deserialization & Injection Attacks
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