# 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.

- **Severity:** High 7.2 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Oct 2026
- **Updated:** 15 Oct 2026
- **Also known as:** GHSA-qqxc-3cx7-qv45

## 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 (Improper Neutralization of Input During Web Page Generation)

## 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.

## Is CVE-2026-102562 being exploited?

There is no known exploitation of CVE-2026-102562 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-102562 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-102562 in the wild and no public exploit code.

Affected product: acyba AcyMailing – An Ultimate Newsletter Plugin and Marketing Automation Solution for WordPress. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-102562/ (Markdown: https://insights.sbomify.com/CVE-2026-102562/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-102562
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-102562
- OSV: https://osv.dev/vulnerability/CVE-2026-102562

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-102562/
Summaries are generated and may contain mistakes; the official description above is the record.