CVE-2026-3643 Cross-site scripting in Accessibly – WordPress Website Accessibility
Unauthenticated attackers can inject malicious JavaScript via REST API endpoints, leading to stored XSS execution for all site visitors.
- 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-2026-3643?
CVE-2026-3643 is a high-severity cross-site scripting vulnerability in onthemapmarketing Accessibly – WordPress Website Accessibility, published on 15 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Accessibly plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the REST API in all versions up to, and including, 3.0.3. The plugin registers REST API endpoints at `/otm-ac/v1/update-widget-options` and `/otm-ac/v1/update-app-config` with the `permission_callback` set to `__return_true`, which means no authentication or authorization check is performed. The `updateWidgetOptions()` function in `AdminApi.php` accepts user-supplied JSON data and passes it directly to `AccessiblyOptions::updateAppConfig()`, which saves it to the WordPress options table via `update_option()` without any sanitization or validation. The stored `widgetSrc` value is later retrieved by `AssetsManager::enqueueFrontendScripts()` and passed directly to `wp_enqueue_script()` as the script URL, causing it to be rendered as a `<script>` tag on every front-end page. This makes it possible for unauthenticated attackers to inject arbitrary JavaScript that executes for all site visitors by changing the `widgetSrc` option to point to a malicious external script.
Weakness: CWE-79
Which versions are affected by CVE-2026-3643?
How do I fix CVE-2026-3643?
No fix has been published for CVE-2026-3643 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-2026-3643 being exploited?
There is no known exploitation of CVE-2026-3643 in the wild and no public exploit code.
Sources
Also known as GHSA-7xm7-cgqr-v2h2.