CVE-2022-50947 Overview
CVE-2022-50947 is a stored cross-site scripting (XSS) vulnerability in the WordPress Testimonial Slider and Showcase plugin version 2.2.6. The flaw resides in the handling of the post_title parameter, which the plugin fails to sanitize before storing and rendering. An authenticated user with editor privileges can inject JavaScript through the testimonial title field. The payload executes in the browser of any user who views the resulting draft post, enabling cookie theft and session hijacking. The vulnerability is tracked under [CWE-79] (Improper Neutralization of Input During Web Page Generation).
Critical Impact
Authenticated editors can store JavaScript payloads in testimonial titles, leading to script execution in viewers' browsers, session hijacking, and account takeover of higher-privileged WordPress users.
Affected Products
- WordPress Testimonial Slider and Showcase plugin version 2.2.6
- WordPress sites with the plugin installed and editor-level accounts provisioned
- Any WordPress deployment exposing the affected post_title workflow
Discovery Timeline
- 2026-05-10 - CVE-2022-50947 published to NVD
- 2026-05-12 - Last updated in NVD database
Technical Details for CVE-2022-50947
Vulnerability Analysis
The Testimonial Slider and Showcase plugin accepts user-supplied content in the post_title field when an editor creates or updates a testimonial. The plugin stores this value in the WordPress database and later renders it back into HTML pages without escaping. Because no sanitization function such as wp_kses or esc_html is applied at the storage or output stage, arbitrary HTML and JavaScript persists across page loads. Stored XSS of this kind is more impactful than reflected XSS because the payload triggers automatically whenever any user loads the affected post.
Root Cause
The root cause is missing output encoding and input sanitization on the post_title parameter within the plugin's testimonial creation workflow. WordPress provides built-in helpers for escaping output, but the plugin does not invoke them for this field. The classification under [CWE-79] reflects improper neutralization of script-related characters such as <, >, and quoted attribute delimiters.
Attack Vector
Exploitation requires an authenticated account with editor privileges and minimal user interaction from a victim who views the draft post. An attacker submits a testimonial whose title contains an HTML element such as a <script> tag or an event handler like onerror attached to an <img> element. When an administrator or other reviewer opens the testimonial, the browser executes the stored payload in the WordPress session context. The attacker can exfiltrate cookies, perform actions on behalf of the victim, or pivot to administrative takeover. Technical details and a proof of concept are available in Exploit-DB #51007 and the VulnCheck Advisory.
Detection Methods for CVE-2022-50947
Indicators of Compromise
- Testimonial posts whose post_title field contains HTML tags such as <script>, <img>, <svg>, or inline event handlers like onerror= and onload=.
- WordPress database rows in wp_posts where post_type corresponds to testimonials and post_title contains angle brackets or JavaScript URI schemes.
- Unexpected outbound requests from administrator browsers shortly after reviewing draft testimonials.
Detection Strategies
- Query the WordPress database for testimonial titles containing <, >, javascript:, or on[a-z]+= patterns.
- Review web server access logs for POST requests to testimonial endpoints accompanied by encoded script payloads in form fields.
- Inspect browser Content Security Policy (CSP) violation reports for inline script execution on testimonial pages.
Monitoring Recommendations
- Audit WordPress editor and author accounts for unexpected logins or testimonial submissions.
- Enable WordPress activity logging to capture post creation and update events with the originating user and IP address.
- Monitor admin sessions for anomalous API calls originating immediately after a testimonial preview is opened.
How to Mitigate CVE-2022-50947
Immediate Actions Required
- Disable or uninstall the Testimonial Slider and Showcase plugin until a patched release is verified.
- Audit all existing testimonial entries and remove any post_title values containing HTML or JavaScript.
- Rotate session cookies and force re-authentication for administrator accounts that may have viewed malicious drafts.
Patch Information
No vendor patch reference is listed in the available advisory data for version 2.2.6. Site operators should consult the WordPress Plugin Page for the latest release and changelog. Upgrade to a version published after the vulnerability disclosure and confirm the fix addresses sanitization of the post_title parameter.
Workarounds
- Restrict editor role assignment to trusted users and remove the capability from accounts that do not require it.
- Deploy a web application firewall (WAF) rule that blocks HTML tags and event handler attributes submitted to testimonial creation endpoints.
- Enforce a strict Content Security Policy that disallows inline scripts on WordPress admin and front-end pages.
# Configuration example: WordPress capability restriction via WP-CLI
wp cap remove editor edit_others_posts
wp cap remove editor publish_posts
wp user list --role=editor --field=user_login
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
