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WordPress plugin

Mailchimp For WP <= 4.1.7 — Cross-Site Scripting

CVE-2017-18577Published · Updated

Action summary

Affected: ≤4.1.7Update to 4.1.8 or newer

All remediation steps
Watch plugin
Severity
Medium6.1
CVSS
6.1
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
What does this vector mean?
AV:N Attack vector
Network
AC:L Attack complexity
Low
PR:N Privileges required
None
UI:R User interaction
Required
S:C Scope
Changed
C:L Confidentiality
Low
I:L Integrity
Low
A:N Availability
None
Weakness
CWE-79 Cross-Site Scripting
Required access
No account needed
Exploit prediction (EPSS)
No score
CISA KEV
Not listed
On this page8

Am I affected?

MC4WP: Mailchimp for WordPress mailchimp-for-wp

  1. Affected≤ 4.1.7
  2. Patched in4.1.8

Update to 4.1.8 or newer.

You are affected if you run ≤ 4.1.7. Version 4.1.8 and later are not affected by this issue.

  • Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under MC4WP: Mailchimp for WordPress.
  • No admin access? Run a passive check of your site. It reads public files only.
  • No account is needed to exploit this. Treat any exposed site on an affected version as at risk.

What to do

  1. Update to version 4.1.8, or a newer patched version
  2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  3. Watch MC4WP: Mailchimp for WordPress to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence.

The mailchimp-for-wp plugin before 4.1.8 for WordPress has XSS via the return value of add_query_arg.

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

More in MC4WP: Mailchimp for WordPress

All 16
More vulnerabilities in MC4WP: Mailchimp for WordPress
SeverityVulnerabilityCVEPublished
Medium5.3Missing Authorization
≤4.14.1Update to 4.15.0
CVE-2026-27356
Medium6.5Unauthenticated Arbitrary Shortcode Execution
≤4.14.0Update to 4.15.0
CVE-2026-118166
Medium5.3Missing Authorization
≤4.14.0Update to 4.15.0
CVE-2026-118167
Medium6.1Reflected Cross-Site Scripting via 'data' Dynamic Content Tag
≤4.14.0Update to 4.14.1
CVE-2026-87917
Medium6.4Authenticated (Author+) Stored Cross-Site Scripting via Form Response Messages
≤4.12.0Update to 4.12.1
CVE-2026-4561

Same weakness (Cross-Site Scripting)

All Cross-Site Scripting
Other Cross-Site Scripting vulnerabilities
SeverityVulnerabilityCVEPublished
High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup≤5.25.25Update to 5.26.45
CVE-2026-120688
Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder≤1.0.2Update to 1.1
CVE-2026-125055
Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System≤3.3.9Update to 3.4.0
CVE-2026-119077
Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce≤5.127.0Update to 5.128.0
CVE-2026-121518

Timeline

  1. CVE published

    Severity medium, CVSS 6.1

  2. Record last updated

Sources & licenses

Wordfence record
Vulnerability data
Wordfence Intelligence. [object Object] Licensed under the CC BY-SA 4.0.
CVE® identifiers
[object Object]. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
CVSS / CWE
National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
VulnCrest content
Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.

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