CVE-2024-43211Network attack vector

Stored script execution via unsanitized plugin settings

Published Nov 1, 2024 · Updated Apr 28, 2026

Stored cross-site scripting in PluginOps MailChimp Subscribe Forms 4.0.9.9 and earlier allows remote authenticated users to execute scripts. Plugin settings accept and later render persistent input without sufficient sanitization or output escaping. Editor-level access or higher and a victim page view are required, and exposure is limited to multisite installations or sites with unfiltered_html disabled.

CVSS severity5.9
Medium
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in PluginOps MailChimp Subscribe Forms 4.0.9.9 and earlier allows remote authenticated users to execute scripts. Plugin settings accept and later render persistent input without sufficient sanitization or output escaping. Editor-level access or higher and a victim page view are required, and exposure is limited to multisite installations or sites with unfiltered_html disabled.

The record

CVE
CVE-2024-43211
Published
Nov 1, 2024
Updated
Apr 28, 2026
Vendor
PluginOps
Product
MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder
Classifications
CWE-79, CAPEC-592, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 1, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=n/a <=4.0.9.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

PluginOps · MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builderversion=n/a <=4.0.9.9

Published CVSS scores

5.9PatchstackCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-592Stored XSS
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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