CVE-2025-31094: WP Posts Carousel Stored XSS Vulnerability

CVE-2025-31094 Overview

CVE-2025-31094 is a stored Cross-Site Scripting (XSS) vulnerability in the teastudio.pl WP Posts Carousel plugin for WordPress. The flaw affects all versions up to and including 1.3.8. Attackers with low-privileged authenticated access can inject malicious scripts that persist in the application and execute in the browsers of users who view affected pages. The vulnerability is tracked under CWE-79, Improper Neutralization of Input During Web Page Generation.

Critical Impact
Successful exploitation enables stored script execution in victim browsers, leading to session theft, administrative action abuse, and content tampering on affected WordPress sites.

Affected Products

teastudio.pl WP Posts Carousel plugin for WordPress
All versions from n/a through 1.3.8
WordPress sites with the wp-posts-carousel plugin installed and activated

Discovery Timeline

2025-03-28 - CVE-2025-31094 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-31094

Vulnerability Analysis

The WP Posts Carousel plugin fails to properly neutralize user-supplied input before rendering it inside generated web pages. An authenticated attacker with contributor-level or higher privileges can submit crafted payloads through plugin inputs. The payload is stored in the WordPress database and served to any user who loads a page containing the carousel output.

Because the injected script executes in the context of the victim's browser session, the attacker can hijack cookies, perform actions as the victim, or redirect users to attacker-controlled infrastructure. User interaction is required for exploitation, but the scope is changed because stored content served to administrators can escalate the impact to the WordPress site itself.

Root Cause

The root cause is missing or insufficient output encoding and input sanitization in the plugin's carousel configuration or content fields. WordPress provides functions such as wp_kses_post(), esc_attr(), and esc_html() to neutralize dangerous markup, but the vulnerable code paths render stored values without applying these controls. The result is a classic persistent XSS primitive.

Attack Vector

Exploitation requires network access to the WordPress admin interface and a low-privileged authenticated account. The attacker submits HTML or JavaScript into a vulnerable plugin field used by the carousel. When any site visitor or administrator loads a page that renders the carousel, the browser parses and executes the stored script. See the Patchstack advisory for additional technical context.

Detection Methods for CVE-2025-31094

Indicators of Compromise

Carousel configuration fields or post metadata containing <script>, onerror=, onload=, or javascript: strings
Unexpected outbound requests from administrator browsers to unknown domains after visiting pages with the carousel rendered
New or modified WordPress administrator accounts created shortly after an authenticated user interacted with carousel content

Detection Strategies

Audit the wp_postmeta and plugin option tables for HTML or script content in wp-posts-carousel entries
Review WordPress audit logs for low-privileged users editing or publishing carousel content
Inspect page responses for script tags originating from carousel shortcode output

Monitoring Recommendations

Enable a Web Application Firewall (WAF) rule set that logs stored XSS payload patterns submitted to wp-admin endpoints
Monitor WordPress REST API and admin-ajax.php requests tied to the wp-posts-carousel plugin
Alert on administrator session activity that originates from pages rendering plugin-generated carousels

How to Mitigate CVE-2025-31094

Immediate Actions Required

Identify all WordPress sites running the WP Posts Carousel plugin version 1.3.8 or earlier
Deactivate the plugin on affected sites until a fixed version is confirmed installed
Rotate credentials for any administrator who may have loaded pages containing untrusted carousel content
Review contributor and author accounts for signs of abuse

Patch Information

At the time of publication, the advisory lists all versions through 1.3.8 as affected. Site operators should consult the Patchstack vulnerability report and the plugin vendor's channels for a patched release. If no fix is available, uninstall the plugin and remove any stored carousel content from the database.

Workarounds

Restrict carousel content editing to trusted administrator accounts only
Deploy a WAF rule that blocks script tags and event handler attributes submitted to plugin endpoints
Enforce a Content Security Policy (CSP) that disallows inline script execution on pages rendering plugin output
Remove the plugin entirely if business requirements do not depend on it

bash

# Configuration example: locate and disable the vulnerable plugin via WP-CLI
wp plugin list --name=wp-posts-carousel --fields=name,status,version
wp plugin deactivate wp-posts-carousel
wp plugin uninstall wp-posts-carousel