CVE-2026-4561— MC4WP: Mailchimp for WordPress <= 4.12.0 - Authenticated (Author+) Stored Cross-Site Scripting via Form Response Messages
Quick assessment
Affected
dvankooten MC4WP: Mailchimp for WordPress
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
WordPress 插件 MC4WP: Mailchimp for WordPress 存在存储型跨站脚本（XSS）漏洞。该漏洞源于在 4.12.0 及更早版本中，表单响应消息的自定义字段（如 、 ）存在输入清理和输出转义不足的问题。这使拥有作者级及以上权限的攻击者能够在页面中注入任意恶意 Web 脚本，当用户访问被注入的页面时，这些脚本将自动执行。
Possible ATT&CK Techniques 1 AI
T1059.001 · PowerShellAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| dvankooten | MC4WP: Mailchimp for WordPress | ≤ 4.12.0 |
affected |
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-4561
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
MC4WP: Mailchimp for WordPress <= 4.12.0 - Authenticated (Author+) Stored Cross-Site Scripting via Form Response Messages
Source: CVE Program / CVE List V5
Vulnerability Description
The MC4WP: Mailchimp for WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the form response message post meta fields (e.g., 'text_subscribed', 'text_error') in all versions up to, and including, 4.12.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| dvankooten | MC4WP: Mailchimp for WordPress | 0 ~ 4.12.0 | - |
|
II. Public POCs for CVE-2026-4561
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-4561
请登录查看更多情报信息。
Patches & Fixes for CVE-2026-4561 (3)
Vendor Advisories for CVE-2026-4561 (1)
IV. Related Vulnerabilities
Same product: MC4WP: Mailchimp for WordPress
-
CVE-2026-1781
MC4WP: Mailchimp for WordPress <= 4.11.1 - Missing Authoriza -
CVE-2024-8680
MailChimp for Wordpress <= 4.9.16 - Authenticated (Administr -
CVE-2024-8850
MC4WP: Mailchimp for WordPress 4.9.9 - 4.9.16 - Reflected Cr -
CVE-2021-36833
WordPress MC4WP plugin <= 4.8.6 - Authenticated Stored Cross
Same vendor: dvankooten
-
CVE-2026-1781
MC4WP: Mailchimp for WordPress <= 4.11.1 - Missing Authoriza -
CVE-2024-9704
Social Sharing (by Danny) <= 1.3.7 - Authenticated (Contribu -
CVE-2024-9210
MC4WP: Mailchimp Top Bar <= 1.6.0 - Reflected Cross-Site Scr -
CVE-2024-8662
Koko Analytics <= 1.3.12 - Reflected Cross-Site Scripting -
CVE-2024-8680
MailChimp for Wordpress <= 4.9.16 - Authenticated (Administr
Same weakness: CWE-79
-
CVE-2026-8630
justhtml before 1.12.0 Mutation XSS via Raw Text Elements -
CVE-2026-8445
justhtml before 1.12.0 Sanitizer Bypass via Markdown -
CVE-2026-77088
justhtml 0.9.0 through 1.21.0 Cross-Site Scripting via code- -
CVE-2026-74793
justhtml before 3.11.0 XSS via selectedcontent projection -
CVE-2026-6827
justhtml before 1.17.0 Multiple Cross-Site Scripting Vulnera
V. Comments for CVE-2026-4561
No comments yet