WordPress High · CVSS 8.8 CVE-2026-15426 August 11, 2026

AcyMailing – An Ultimate Newsletter Plugin and Marketing Automation Solution for WordPress: account takeover

AcyMailing – An Ultimate Newsletter Plugin and Marketing Automation Solution for WordPress

Account takeover in the AcyMailing – An Ultimate Newsletter Plugin and Marketing Automation Solution for WordPress component. Threat level: High (CVSS 8.8).

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Who is affected

This vulnerability affects: AcyMailing – An Ultimate Newsletter Plugin and Marketing Automation Solution for WordPress. If you use this component on your site, check the version and update it as soon as possible.

How dangerous

Rating: High, CVSS 8.8 out of 10. It is worth acting before the flaw is exploited.

What this flaw is

Account takeover lets an attacker seize an existing account (often an administrator), e.g. by changing the email address or resetting the password around the protections.

Losing the administrator account means losing control of the whole site and its users' data.

Score breakdown (CVSS vector)

What the CVSS 8.8 rating means in practice:

  • The attack can be carried out remotely, over the internet.
  • Requires an ordinary, low-privileged account.
  • Requires no action from the victim.
  • At risk: data confidentiality, integrity (data can be altered), site availability.

Weakness class: CWE-269.

What to do

  • Update the vulnerable component (AcyMailing – An Ultimate Newsletter Plugin and Marketing Automation Solution for WordPress) to the latest version.
  • If a patch is not out yet, temporarily disable the vulnerable element.
  • Check whether the site has already been attacked: unusual files, new administrator accounts, redirects.
  • Make a backup before you start making changes.
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