CVE-2025-15658 Overview
CVE-2025-15658 is a stored Cross-Site Scripting (XSS) vulnerability affecting the WP Emmet WordPress plugin in versions up to and including 0.3.4. The flaw is categorized under [CWE-79], improper neutralization of input during web page generation. Exploitation requires administrator-level privileges and user interaction, which limits practical attack scope. A successful attack injects script content that executes in the context of another authenticated user's browser session. The vulnerability was published to the National Vulnerability Database on 2026-06-15 and is tracked by Patchstack in its WordPress vulnerability database.
Critical Impact
An authenticated administrator can inject persistent JavaScript that executes against other users of the WordPress site, enabling session theft, content manipulation, or pivot into broader site compromise.
Affected Products
- WP Emmet WordPress plugin versions <= 0.3.4
- WordPress installations with the WP Emmet plugin enabled
- Any administrator account on a vulnerable instance
Discovery Timeline
- 2026-06-15 - CVE-2025-15658 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-15658
Vulnerability Analysis
The vulnerability is a stored Cross-Site Scripting issue in the WP Emmet plugin for WordPress. The plugin fails to properly neutralize user-supplied input before rendering it in administrative or front-end contexts. An attacker with administrator privileges can supply crafted HTML or JavaScript payloads through plugin inputs. Those payloads persist in WordPress storage and execute when another user views the affected page. The scope change in the impact profile reflects that injected scripts can affect components beyond the vulnerable plugin, including the WordPress administrative interface and authenticated session data.
Root Cause
The root cause is missing or insufficient output encoding when the plugin renders stored input. WordPress provides sanitization helpers such as wp_kses_post, esc_html, and esc_attr that prevent HTML and script injection. The WP Emmet plugin through version 0.3.4 does not apply these controls consistently to fields accessible to administrators.
Attack Vector
Exploitation requires an authenticated administrator session and a victim user interaction. An attacker who has compromised or is operating an administrator account submits a payload through a plugin input field. The payload is stored server-side and rendered without proper encoding. When another user, including another administrator, loads the affected view, the injected script executes in their browser context. See the Patchstack WordPress XSS Vulnerability advisory for additional technical context.
No verified public proof-of-concept code is available. The vulnerability mechanism follows the standard stored XSS pattern: untrusted input persisted to the database and reflected to other users without contextual output encoding.
Detection Methods for CVE-2025-15658
Indicators of Compromise
- Unexpected <script> tags, javascript: URIs, or on* event handler attributes stored in WP Emmet plugin database fields
- WordPress administrator accounts with session activity originating from unfamiliar IP addresses or user agents
- Outbound HTTP requests from administrator browsers to attacker-controlled domains shortly after viewing plugin-managed pages
Detection Strategies
- Audit the WordPress database tables wp_options and wp_postmeta for plugin entries containing HTML or script content
- Enable a Content Security Policy in report-only mode to surface inline script execution attempts in the admin interface
- Review WordPress audit logs for changes to WP Emmet plugin settings performed by administrator accounts
Monitoring Recommendations
- Monitor administrator account logins for anomalous geolocation, time-of-day, or device fingerprint changes
- Alert on creation or modification of WordPress users with elevated roles following plugin configuration changes
- Track outbound requests from WordPress hosts to uncategorized or newly registered domains
How to Mitigate CVE-2025-15658
Immediate Actions Required
- Update the WP Emmet plugin to a version later than 0.3.4 once the maintainer publishes a fix
- Restrict administrator account access using strong authentication and multi-factor authentication
- Review existing plugin configuration entries for any previously injected payloads and remove them
Patch Information
No fixed version is identified in the available advisory data. Consult the Patchstack advisory for the latest patch availability status. Patchstack subscribers may receive virtual patching coverage through the Patchstack mitigation service.
Workarounds
- Deactivate and remove the WP Emmet plugin until a patched release is published
- Apply a web application firewall rule that blocks script tags and JavaScript event handlers in plugin-specific POST parameters
- Limit the number of administrator accounts and enforce least privilege for plugin configuration tasks
# Disable the WP Emmet plugin via WP-CLI until a patch is available
wp plugin deactivate wp-emmet
wp plugin delete wp-emmet
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
