Accessibly <= 3.0.3 - Missing Authorization to Unauthenticated Stored Cross-Site Scripting via Widget Source Injection via REST API

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.

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Published

Apr 14, 2026

Last Updated

Apr 14, 2026

Slug

otm-accessibly

Risk Profile

7.2 CVSS Score

Weakness

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Researchers

chaeyp

Ronnachai Sretawat Na Ayutaya (Simonhaskelly)

Ronnachai Chaipha (rxnr)

Operational Summary

What the operator needs to know

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Patch Status

No patched release listed

Remediation

No known patch available. Please review the vulnerability's details in depth and employ mitigations based on your organization's risk tolerance. It may be best to uninstall the affected software and find a replacement.

References

https://www.wordfence.com/threat-intel/vulnerabilities/id/f8234ea2-ff80-425f-b83d-29c422b40c6a?source=api-prod

Detailed Metadata

Software Type	Plugin
Software Slug	otm-accessibly View on wordpress.org
CVE	CVE-2026-3643
Patched Versions	No patched versions published.
Affected Versions	*-3.0.3

Licensing Notices

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DEFIANT

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MITRE

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