onthemapmarketing Accessibly Plugin up to 3.0.3 on WordPress REST API Endpoint update-widget-options updateWidgetOptions widgetSrc cross site scripting

Summaryinfo

A vulnerability, which was classified as problematic, has been found in onthemapmarketing Accessibly Plugin up to 3.0.3 on WordPress. This affects the function updateWidgetOptions of the file /otm-ac/v1/update-widget-options of the component REST API Endpoint. This manipulation of the argument widgetSrc causes cross site scripting. This vulnerability appears as CVE-2026-3643. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability has been found in onthemapmarketing Accessibly Plugin up to 3.0.3 on WordPress and classified as problematic. Affected by this vulnerability is the function updateWidgetOptions of the file /otm-ac/v1/update-widget-options of the component REST API Endpoint. The manipulation of the argument widgetSrc with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

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 `` 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.

The weakness was presented by Yoschanin Pulsirivong, Ronnachai Sretawat Na Ayutaya and Ronnachai Chaipha. The advisory is shared at wordfence.com. This vulnerability is known as CVE-2026-3643 since 03/06/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• WordPress Plugin

Vendor

• onthemapmarketing

Name

• Accessibly Plugin

Version

• 3.0.0
• 3.0.1
• 3.0.2
• 3.0.3

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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