CVE-2026-102562 AcyMailing <= 11.1.0 - Unauthenticated Stored Cross-Site Scripting via 'customField[]' Parameter
Unauthenticated attackers can inject arbitrary scripts via the customField parameter, leading to code execution or account takeover when administrators view subscriber archives.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-102562?
CVE-2026-102562 is a high-severity cross-site scripting vulnerability in acyba AcyMailing – An Ultimate Newsletter Plugin and Marketing Automation Solution for WordPress, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-102562?
How do I fix CVE-2026-102562?
No fix has been published for CVE-2026-102562 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-102562 being exploited?
There is no known exploitation of CVE-2026-102562 in the wild and no public exploit code.
Sources
Also known as GHSA-qqxc-3cx7-qv45.