CVE-2021-4422— POST SMTP Mailer <= 2.0.20 - Cross-Site Request Forgery Bypass
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I. Basic Information for CVE-2021-4422
Vulnerability Information
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Vulnerability Title
POST SMTP Mailer <= 2.0.20 - Cross-Site Request Forgery Bypass
Source: NVD (National Vulnerability Database)
Vulnerability Description
The POST SMTP Mailer plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 2.0.20. This is due to missing or incorrect nonce validation on the handleCsvExport() function. This makes it possible for unauthenticated attackers to trigger a CSV export via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
跨站请求伪造(CSRF)
Source: NVD (National Vulnerability Database)
Vulnerability Title
WordPress Plugin POST SMTP Mailer 跨站请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台支持在PHP和MySQL的服务器上架设个人博客网站。WordPress plugin是一个应用插件。 WordPress Plugin POST SMTP Mailer 存在跨站请求伪造漏洞，该漏洞源于 handleCsvExport() 函数上缺少或不正确的随机数验证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| wpexpertsio | POST SMTP Mailer – Email log, Delivery Failure Notifications and Best Mail SMTP for WordPress | * ~ 2.0.20 | - |
II. Public POCs for CVE-2021-4422
| # | POC Description | Source Link | Shenlong Link |
|---|
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No public POC found.
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Same Patch Batch · saadiqbal · 2023-07-12 · 3 CVEs total
| CVE-2023-3082 | 7.2 HIGH | Post SMTP <= 2.5.7 - Unauthenticated Stored Cross-Site Scripting via Email |
| CVE-2021-4411 | 4.3 MEDIUM | WP EasyPay – Square for WordPress <= 3.2.0 - Cross-Site Request Forgery Bypass |
IV. Related Vulnerabilities
Same product: Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App
- CVE-2026-3090
Post SMTP <= 3.8.0 - Unauthenticated Stored Cross-Site Scrip - CVE-2026-2559
Post SMTP <= 3.8.0 - Missing Authorization to Authenticated - CVE-2025-12887
Post SMTP – Complete SMTP Solution with Logs, Alerts, Backup - CVE-2025-11833
Post SMTP – Complete SMTP Solution with Logs, Alerts, Backup - CVE-2025-9219
Post SMTP <= 3.4.1 - Missing Authorization to Authenticated
Same vendor: saadiqbal
- CVE-2026-3090
Post SMTP <= 3.8.0 - Unauthenticated Stored Cross-Site Scrip - CVE-2026-2559
Post SMTP <= 3.8.0 - Missing Authorization to Authenticated - CVE-2026-1674
Gutena Forms – Contact Form, Survey Form, Feedback Form, Boo - CVE-2026-0550
myCred <= 2.9.7.3 - Authenticated (Contributor+) Stored Cros - CVE-2026-0832
New User Approve <= 3.2.2 - Missing Authorization to Unauthe
Same weakness: CWE-352
- CVE-2021-47953
OpenCart 3.0.3.7 Cross-Site Request Forgery via account/pass - CVE-2021-47946
OpenCart 3.0.36 Account Takeover via Cross Site Request Forg - CVE-2022-50955
WordPress Plugin Curtain 1.0.2 Cross-site Request Forgery - CVE-2026-8194
osTicket Dispatcher class.dispatcher.php cross-site request - CVE-2026-42286
Emlog: Cross-Site Request Forgery in Admin Functions
V. Comments for CVE-2021-4422
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