# AcyMailing < 11.1.2 - Unauthenticated Missing Authorization to Subscriber Unsubscription

- **ID:** WPSEC-2026-3076
- **Plugin:** AcyMailing – An Ultimate Newsletter Plugin and Marketing Automation Solution for WordPress (`acymailing`), https://wordpress.org/plugins/acymailing/
- **Affected versions:** all versions before 11.1.2
- **Fixed in:** 11.1.2 (Update to 11.1.2 or later.)
- **Severity:** Medium 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
- **Weakness:** CWE-862
- **Usage among sites WPSec scans:** plugin Medium, affected versions Medium (as of 2026-11-13)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/acymailing
- **Fix released:** 2026-11-12
- **Published:** 2026-11-13
- **URL:** https://wpsec.com/vuln/WPSEC-2026-3076/

## Description

The AcyMailing plugin for WordPress is vulnerable to unauthorized modification of data in all versions up to, and including, 11.1.1. This is due to the unsubscribe handler and the subscription form acting on the subscriber matching a submitted email address without verifying that the requester owns that address, unless subscriber data modifications without authentication were disabled. This makes it possible for unauthenticated attackers to unsubscribe any subscriber whose email address they know from mailing lists.

## References

- https://wpsec.com/vuln/WPSEC-2026-3076/
- https://plugins.svn.wordpress.org/acymailing/tags/11.1.2/
- https://wordpress.org/plugins/acymailing/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-3076/

License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Free to use, share and adapt, also commercially, if you credit WPSec and link to this advisory.