# CVE-2026-13770: AppMySite <= 3.15.3 - Authenticated (Subscriber+) Stored Cross-Site Scripting via save_ams_license_key AJAX Handler

> Authenticated attackers can inject arbitrary scripts via the license key handler, leading to potential session hijacking or malicious actions on behalf of other users.

- **Severity:** Medium 6.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Sep 2026
- **Updated:** 19 Sep 2026
- **Also known as:** GHSA-jvq2-fm7m-3q4c

## What is CVE-2026-13770?

CVE-2026-13770 is a medium-severity cross-site scripting vulnerability in AppMySite – WordPress & WooCommerce Mobile App Builder (No-Code Android & iOS App Maker), published on 19 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The AppMySite – WordPress & WooCommerce Mobile App Builder (No-Code Android & iOS App Maker) plugin for WordPress is vulnerable to Stored Cross-Site Scripting via save_ams_license_key AJAX Handler in all versions up to, and including, 3.15.3 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The save_ams_license_key AJAX handler performs no capability check and no nonce verification, meaning any authenticated user with Subscriber-level access or above can invoke it to store the malicious payload.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-13770?


## How do I fix CVE-2026-13770?

No fix has been published for CVE-2026-13770 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-13770 being exploited?

There is no known exploitation of CVE-2026-13770 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-13770 and fix it if it is affected.

What it is: CVE-2026-13770 is a medium-severity cross-site scripting vulnerability in AppMySite – WordPress & WooCommerce Mobile App Builder (No-Code Android & iOS App Maker), published on 19 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-13770 in the wild and no public exploit code.

Affected product: AppMySite – WordPress & WooCommerce Mobile App Builder (No-Code Android & iOS App Maker). 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-2026-13770/ (Markdown: https://insights.sbomify.com/CVE-2026-13770/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-13770
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-13770
- OSV: https://osv.dev/vulnerability/CVE-2026-13770

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-13770/
Summaries are generated and may contain mistakes; the official description above is the record.