CVE-2025-22727

WordPress MailChimp Subscribe Form plugin <= 4.1 - Cross Site Scripting (XSS) vulnerability

Published Jan 21, 2025 CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed

Description

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in PluginOps MailChimp Subscribe Forms mailchimp-subscribe-sm allows Stored XSS.This issue affects MailChimp Subscribe Forms : from n/a through <= 4.1.

Analysis

Technical impact

The PluginOps MailChimp Subscribe Forms plugin has improper neutralization of input during web page generation, allowing stored cross‑site scripting. An attacker can embed malicious JavaScript that is saved as part of the form and then delivered to any visitor who views the page containing the form, leading to a compromise of the victim’s browser. This weakness is identified as CWE‑79.

Affected Systems

Any WordPress site running the MailChimp Subscribe Forms plugin version 4.1 or earlier, as identified by the CNA entry PluginOps:MailChimp Subscribe Forms.

Risk and Exploitability

The CVSS score of 6.5 classifies the vulnerability as moderate severity. Its EPSS score is below 1 %, indicating a very low probability of exploitation at the time of analysis. The plugin is not listed in CISA’s KEV catalog, and the CVE description does not reference any public exploits. Based on the description, an attacker can inject malicious payloads into the plugin’s form fields, which are then stored and served to other visitors, executing in their browsers without requiring server‑side privileges.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

PluginOps

MailChimp Subscribe Forms

unaffected

Version	Status	Constraints
`0`	affected	≤ 4.1

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Upgrade the MailChimp Subscribe Forms plugin to the latest version that removes the XSS flaw.
Prior to updating, back up the website and plugin data to prevent loss of content.
If an immediate patch is unavailable, restrict the form to trusted administrators, disable the plugin temporarily, or block the vulnerable endpoints until a secure update can be applied.

Generated by OpenCVE AI on May 2, 2026 at 05:51 UTC.

Tracking

Advisories

Source	ID	Title
EUVD	EUVD-2025-2946	Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in PluginOps MailChimp Subscribe Forms allows Stored XSS. This issue affects MailChimp Subscribe Forms : from n/a through 4.1.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.244% probability within 30 days)

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://patchstack.com/database/Wordpress/Plugin/mailchimp-subscribe-sm/vulnerability/wordpress-mailchimp-subscribe-form-plugin-4-1-cross-site-scripting-xss-vulnerability?_s_id=cve

History

Apr 23, 2026 3:00 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		cvssV3_1 `{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L'}`

Apr 1, 2026 11:45 PM Description updated. References updated. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description	Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in PluginOps MailChimp Subscribe Forms allows Stored XSS. This issue affects MailChimp Subscribe Forms : from n/a through 4.1.	Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in PluginOps MailChimp Subscribe Forms mailchimp-subscribe-sm allows Stored XSS.This issue affects MailChimp Subscribe Forms : from n/a through <= 4.1.
References	https://patchstack.com/database/wordpress/plugin/mailchimp-subscribe-sm/vulnerability/wordpress-mailchimp-subscribe-form-plugin-4-1-cross-site-scripting-xss-vulnerability?_s_id=cve	https://patchstack.com/database/Wordpress/Plugin/mailchimp-subscribe-sm/vulnerability/wordpress-mailchimp-subscribe-form-plugin-4-1-cross-site-scripting-xss-vulnerability?_s_id=cve
Metrics	cvssV3_1 `{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L'}`

Feb 12, 2025 9:15 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Jan 21, 2025 2:15 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in PluginOps MailChimp Subscribe Forms allows Stored XSS. This issue affects MailChimp Subscribe Forms : from n/a through 4.1.
Title		WordPress MailChimp Subscribe Form plugin <= 4.1 - Cross Site Scripting (XSS) vulnerability
Weaknesses		CWE-79
References		https://patchstack.com/database/wordpress/plugin/mailchimp-subscribe-sm/vulnerability/wordpress-mailchimp-subscribe-form-plugin-4-1-cross-site-scripting-xss-vulnerability?_s_id=cve
Metrics		cvssV3_1 `{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L'}`