Acyba AcyMailing Plugin up to 11.1.0 on WordPress Subscriber Insertion acym_cleanVar customField[] cross site scripting

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Acyba AcyMailing Plugin up to 11.1.0. This impacts the function acym_cleanVar of the component Subscriber Insertion. This manipulation of the argument customField[] causes cross site scripting. This vulnerability is handled as CVE-2026-102562. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Acyba AcyMailing Plugin up to 11.1.0. It has been declared as problematic. Affected by this vulnerability is the function acym_cleanVar of the component Subscriber Insertion. The manipulation of the argument customField[] with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

The AcyMailing plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the customField[] parameter of the public frontusers::subscribe endpoint in versions up to, and including, 11.1.0. This is due to insufficient input sanitization and output escaping in the acym_cleanVar() sanitizer, whose HTML-tag stripper only matches complete tags (requiring a closing '>'), together with SubscriberInsertion::replaceUserInformation() and the archive view template, which substitute the stored subscriber field value into the mail body and emit it without HTML encoding. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses the online-archive URL for the poisoned subscriber, including administrators who click the plugin-generated link in the Subscribers → History screen.

The advisory is shared at wordfence.com. This vulnerability is known as CVE-2026-102562 since 09/29/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-98346). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• WordPress Plugin

Vendor

• Acyba

Name

• AcyMailing Plugin

Version

• 11.0
• 11.1.0

CPE 2.3info

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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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