插件名称	Mail Mint
漏洞类型	XSS（跨站脚本攻击）
CVE 编号	CVE-2026-1447
紧急程度	中等
CVE 发布日期	2026-02-08
来源网址	CVE-2026-1447

Critical Update — Mail Mint (<=1.19.2) CSRF → Stored XSS (CVE-2026-1447): What WordPress Site Owners Must Do Now

By Hong Kong Security Expert — 2026-02-06

Short summary: A Cross-Site Request Forgery (CSRF) vulnerability leading to a stored Cross-Site Scripting (XSS) condition was disclosed in the Mail Mint WordPress plugin (versions <= 1.19.2). The issue is tracked as CVE-2026-1447 and has a CVSS v3.1 score of 7.1. The developer released version 1.19.3 to fix the issue. This advisory explains the risk, detection techniques, mitigation steps, and recovery actions, written from the perspective of a Hong Kong security expert.

执行概述

On 6 February 2026 a CSRF vulnerability that can lead to stored XSS in the Mail Mint plugin (<= 1.19.2) was published (CVE-2026-1447). The flaw allows an attacker to induce a privileged user (for example, an administrator) to trigger a crafted request—often by visiting a malicious page or clicking a link—resulting in persistent JavaScript being saved by the plugin and later executed in the browser context of visitors or administrators.

这为什么重要：

• Stored XSS is high-impact: it can enable session theft, privilege escalation, site defacement, phishing, and unauthorized administrative actions.
• Exploits for this class of vulnerability are commonly weaponised soon after disclosure and can affect both front-end visitors and back-end administrators.
• Rapid response is required: update the plugin, apply temporary mitigations, and hunt for persisted payloads.

This advisory is for site owners, system administrators, WordPress maintainers, hosting providers, and security teams who need concrete steps to detect, mitigate, and recover from potential exploitation.

漏洞是什么（通俗易懂）

• Vulnerability type: CSRF (Cross-Site Request Forgery) leading to stored XSS (Cross-Site Scripting)
• Affected versions: Mail Mint plugin <= 1.19.2
• Fixed in: Mail Mint 1.19.3
• CVE: CVE-2026-1447
• CVSS v3.1 score: 7.1 (High / Medium-High)
• Attack prerequisites: attacker-controlled page or crafted link; requires a privileged user (e.g., logged-in admin) to interact so that malicious script is written to the site.
• Result: persistent JavaScript stored in plugin data (templates, settings, etc.) that executes in the context of visitors or administrators.

In short: an attacker can trick a privileged user into performing an action that causes malicious script content to be stored by the plugin. That stored content can run later when rendering email previews, admin pages, or front-end components.

Possible real-world impacts

Stored XSS may result in:

• Administrative session theft and impersonation.
• Unauthorized creation or modification of content, users, or settings.
• Installation of backdoors, rogue admin users, or malware.
• Theft of user data and credentials via automated form exfiltration.
• Site defacement, fraudulent ad injection, and phishing pages served from your domain.
• Lateral movement within hosting if combined with other vulnerabilities.
• Reputation damage and loss of customer trust.

Because the vulnerability is persistent, a single successful injection can be abused repeatedly until it is discovered and removed.

Quick action checklist — what to do in the next 60 minutes

1. Upgrade Mail Mint to 1.19.3 (or later) immediately, if possible.
2. If you cannot upgrade immediately: deactivate the Mail Mint plugin temporarily.
3. Enable any available web application firewall (WAF) or request your hosting provider to apply virtual patching rules that block XSS payloads and CSRF-like request patterns.
4. Scan the site for malicious scripts in:
   • wp_options (plugin options and serialized data)
   • wp_posts (post_content, postmeta)
   • plugin-specific tables and option keys for Mail Mint
5. Force password resets for administrative users and rotate API keys or SMTP credentials stored on the site.
6. Isolate the site (maintenance mode or temporary domain blocking) if you detect exploitation.

Detailed technical guidance

Below are concrete steps, commands, and checks you can run. Adjust SQL table prefixes if your prefix is not wp_.

Check plugin version with WP-CLI

wp plugin status mail-mint --format=json

Or list all plugins:

wp plugin list | grep mail-mint

If the version returned is <= 1.19.2, plan to upgrade immediately.

升级插件

Preferred method (from WordPress admin or WP-CLI):

wp plugin update mail-mint --version=1.19.3

If automatic updates fail, download the vendor-supplied 1.19.3 package from the official plugin repository and install manually.

If you cannot upgrade: temporarily disable the plugin

From WP-CLI:

wp plugin deactivate mail-mint

From the dashboard: Plugins → Installed Plugins → Deactivate (Mail Mint).

Note: Deactivation may disrupt legitimate email/template functionality. Evaluate impact and schedule a maintenance window.

Hunting for stored XSS payloads in the database

Search for common indicators—script tags, event handlers, suspicious inline JS.

SQL examples (run in your database client or phpMyAdmin):

Search options and plugin settings:

SELECT option_name, option_value
FROM wp_options
WHERE option_name LIKE '%mail_mint%' OR option_value LIKE '%<script%';

Search posts and postmeta:

SELECT ID, post_title
FROM wp_posts
WHERE post_content LIKE '%<script%' OR post_content LIKE '%onerror=%' OR post_content LIKE '%onload=%';

搜索 postmeta：

SELECT meta_id, post_id, meta_key, meta_value;

Search all tables for suspicious content (simple approach; may be slow):

SELECT table_name, column_name
FROM information_schema.columns
WHERE table_schema = 'your_database'
  AND data_type IN ('text','varchar','longtext');
-- then run SELECT queries on those columns looking for <script> tags

Important: Serialized data is common in wp_options; be careful when editing—maintain correct lengths for serialized strings if you modify them directly.

日志和流量指标

• Unusual POST requests to plugin endpoints (check raw request URIs).
• 带有 Content-Type: application/x-www-form-urlencoded containing encoded script markers like %3Cscript%3E or encoded attributes (5. onload, onerror).
• Requests preceded by a referrer from an external domain (malicious trap pages).
• Sudden admin logins (IP/UA anomalies) or POSTs to admin-ajax endpoints that write plugin options.
• Suspicious User-Agent strings or IPs with repeated malicious activity.

Example: search webserver logs (Linux):

zgrep "mail-mint" /var/log/apache2/access.log* | less
zgrep "%3Cscript" /var/log/apache2/access.log* | less

Detecting CSRF-based activity

CSRF appears as unexpected state-changing requests without a valid WordPress nonce or originating referrer. Look for POSTs that write to known plugin endpoints with no wpnonce parameter or with invalid nonces.

Example grep for missing nonces:

zgrep -i "POST .*mail-mint" /var/log/nginx/access.log* | while read -r line; do
  echo "$line" | grep -q 'wpnonce' || echo "Potential CSRF request: $line"
done

What to look for in admin accounts and files

• 未经授权创建的新管理员或编辑帐户。.
• Modified plugin and theme files with base64-encoded payloads or eval() 的用法。.
• Unexpected scheduled tasks (wp_cron) added by unknown users.
• 新的 PHP 文件在 wp-content/uploads (a common persistence technique).

Incident response playbook (if you find evidence of compromise)

1. 控制
   • Put the site into maintenance mode or block access at the hosting level.
   • 立即停用易受攻击的插件。.
   • If practical, take a full snapshot/backup (disk + DB) for forensic analysis.
2. 根除
   • Remove malicious scripts from database rows (careful with serialized data—always update lengths correctly).
   • Remove backdoors and unknown files. Inspect wp-content/uploads, theme directories, and mu-plugins.
3. 恢复
   • Update Mail Mint to 1.19.3 or later.
   • Update WordPress core, themes, and other plugins to the latest versions.
   • Reset all admin and user passwords, and rotate any external credentials the site uses (SMTP/API keys).
4. 事件后加固
   • Re-enable strong 2-factor authentication (2FA) for all privileged users.
   • Review user roles and remove unused admin accounts.
   • Enable monitoring and alerts for file changes, unusual admin logins, and outbound connections.
5. 通知。
   • If user data was accessed, follow applicable notification requirements in your jurisdiction.
   • Inform internal incident response teams and stakeholders as appropriate.

If you are not confident performing cleanup, engage an experienced WordPress security professional. A partially cleaned site often remains compromised if persistence mechanisms are not fully removed.

WAF和虚拟修补建议

Virtual patches are temporary mitigations and do not replace the need to update the vulnerable plugin. If you operate a WAF or can ask your host to apply mitigation rules, consider the following conceptual protections:

• Block requests to plugin endpoints that write settings unless accompanied by a valid WordPress nonce and an authenticated session cookie.
• Block or sanitize requests containing encoded or raw <script>, javascript 的 POST/PUT 有效负载到插件端点：, onload=, onerror=, innerHTML=, or suspicious 评估( 模式。.
• Normalize request bodies and reject POSTs with excessive HTML markup in fields intended for plain text.
• Rate-limit anonymous requests targeting admin endpoints; apply stricter checks for requests from unfamiliar IPs.
• Inspect referrer headers: block state-changing requests if the referrer is external and no valid nonce is present.
• Block payloads attempting to inject </script><script> sequences or encoded equivalents (%3Cscript%3E).

Example WAF pseudo-policy (conceptual):

IF REQUEST_METHOD == POST AND REQUEST_URI matches /wp-admin/admin.php or plugin write endpoint:
  IF no WordPress auth cookie OR POST body missing valid wpnonce:
    BLOCK 403

IF REQUEST_BODY contains '<script' OR 'onerror=' OR 'onload=' OR 'eval(':
  BLOCK (or sanitize and log)

Combine positive allowlists (permit only expected inputs) with negative blocklists (deny known malicious patterns) to reduce false positives while providing effective protection.

Long-term prevention and hardening

Fixing the plugin is the first step. These hardening measures reduce the risk of similar issues in future:

1. 最小权限原则
   • Do not give admin rights to users who don’t need them. Audit roles regularly.
2. 强制实施双因素身份验证
   • Protect all accounts with administrative privileges using two-factor authentication.
3. Strict configuration management
   • Keep a changelog for plugin and theme updates and use staging environments for testing.
4. Input sanitization and output encoding
   • Plugin authors should use WP functions like wp_kses() for allowable HTML and esc_attr(), esc_html(), wp_json_encode() for output encoding.
   • Site owners should prefer plugins with clear security practices, active maintenance, and public changelogs.
5. 监控与警报
   • Enable file integrity monitoring and login anomaly alerts.
   • Configure alerts for suspicious POST traffic and new admin account creation.
6. 备份和恢复
   • Keep immutable backups offsite and test restores periodically. Maintain at least 90 days of backups where practical.
7. Security testing and code auditing
   • Run periodic vulnerability scans and manual audits of high-risk plugins. Use staging to test updates before production rollout.

How to check if your site was attacked via this specific vector

• Check timestamps in wp_options and plugin-specific tables around the disclosure date (6 Feb 2026) and earlier.
• Look for newly added or modified plugin templates, email templates, or custom settings containing <script> 或可疑属性。.
• Compare current DB/tables with a backup from before the disclosure; focus on plugin option names and templates.
• Check access logs for unusual admin page POSTs with external referrers or missing nonces.
• Inspect pages that render plugin-managed content (email previews, subscription forms, custom template snippets) for unexpected inline JavaScript.

If injected code is found, assume compromise and follow the incident response playbook above.

Example detection queries and forensic tips

WP-CLI: find posts with script tags

wp db query "SELECT ID, post_title FROM wp_posts WHERE post_content LIKE '%<script%' LIMIT 200;"

Search uploads for suspicious PHP files (uploads should not normally contain .php):

find wp-content/uploads -type f -iname '*.php' -print

List recently changed files (last 30 days):

find . -type f -mtime -30 -printf '%TY-%Tm-%Td %TT %p

Audit users with 8. 管理员 role:

wp user list --role=administrator --fields=ID,user_login,user_email,display_name,user_registered

检查 wp_options rows likely associated with Mail Mint. The plugin may store templates or options in option keys; look for mail 或 mint substrings:

wp db query "SELECT option_name, SUBSTRING(option_value,1,200) as snippet FROM wp_options WHERE option_name LIKE '%mail%' OR option_name LIKE '%mint%' OR option_value LIKE '%<script%' LIMIT 200;"

Caveat: be careful editing serialized option values directly; prefer using plugin functions or WP-CLI wrappers.

常见问题（FAQ）

Q: If I upgrade to 1.19.3, am I safe?

A: Upgrading closes the specific vulnerability. If your site was exploited prior to upgrade and a malicious payload was stored, upgrading alone will not remove that payload. You must scan and clean any stored content and follow the incident response steps.

Q: Should I delete Mail Mint or switch to another plugin?

A: If Mail Mint provides essential functionality, upgrade it. If you no longer need it, deactivating and removing the plugin is safest. Prefer actively maintained plugins with recent updates and responsive developers.

Q: Can visitors be harmed if the stored XSS is only in admin emails or templates?

A: Yes. Admin-facing payloads can be used to pivot into administrative sessions. If payloads appear in templates presented to end users, visitors may be targeted by phishing, drive-by attacks, or malware redirects.

Q: How does a WAF help here?

A: A properly configured WAF can block exploit attempts (both CSRF chains and injection payloads) and reduce the likelihood of successful exploitation. Virtual patching via WAF is a practical stop-gap while you update and investigate.

Why this vulnerability was exploitable (developer note)

From an application security perspective this class of bug usually indicates one or more of the following:

• Missing or insufficient CSRF protections (WordPress nonces not validated).
• Failure to sanitize or validate input before persisting into templates or settings.
• Rendering user-controlled content without appropriate output encoding.

Plugin authors should validate nonces on state-changing requests, use capability checks (current_user_can()), sanitize inputs with sanitize_text_field(), wp_kses_post() where appropriate, and always encode output for the context in which it is used (HTML, attribute, JS).

If you need external help

If you lack the in-house capability to triage or remediate an incident, engage a reputable WordPress security professional or incident response service. Prioritise providers with proven forensic experience, clear scopes of work, and documented confidentiality and handling procedures. Ensure any third party provides a full scope of cleanup, verification of persistence removal, and a remediation report.

Recommended long-term security checklist

• Inventory: Maintain an asset list (plugins, themes, versions) and monitor for new CVEs affecting items in your inventory.
• Update cadence: Apply minor security updates within 24–72 hours; test major updates on staging.
• Backup policy: Keep frequent, immutable backups stored offsite and regularly verify restore procedures.
• Least privilege: Limit admin accounts and enforce strict role definitions.
• Monitoring: File change detection, WAF logs, and admin activity alerts should be standard operations.
• Incident plan: Formalize procedures, roles, and communication paths for security incidents.

Final notes and contact

Treat any stored content you did not explicitly create as suspicious until it has been verified and cleaned. If you require hands-on assistance, contact a trusted security consultant or your hosting provider’s security team and request forensic analysis and remediation.

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Appendix: Useful commands and resources

• Check plugin status:

  wp plugin status mail-mint

• 停用插件：

  wp plugin deactivate mail-mint

• Scan for script tags in posts:

  wp db query "SELECT ID, post_title FROM wp_posts WHERE post_content LIKE '%<script%'"

• Find PHP files under uploads:

  find wp-content/uploads -type f -iname '*.php'

• Backup DB:

  wp db export backup-$(date +%F).sql

Stay vigilant. Prompt updates, careful inspection of persisted content, and measured incident response are the most reliable defences against CSRF→XSS chains like CVE-2026-1447.

— 香港安全专家