Is CVE-2026-3643 actively exploited?

No active exploitation of CVE-2026-3643 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-3643 be exploited remotely?

Yes. CVE-2026-3643 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-3643?

CVE-2026-3643 has a CVSS score of 7.2 (HIGH).

HOME VULNERABILITIESCVE-2026-3643

HIGH

CVE-2026-3643

CWE-79Published: April 15, 2026· Updated: Apr 15, 2026

7.2

CVSS v3.1

EPSS:0.08%probability of exploitation in 30 daysPercentile:23.4th

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.

NVD Source

Technical Analysis

CVE-2026-3643 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.