CVE-2025-1491: WP Posts Carousel Plugin XSS Vulnerability

CVE-2025-1491 Overview

CVE-2025-1491 is a Stored Cross-Site Scripting (XSS) vulnerability [CWE-79] in the WP Posts Carousel plugin for WordPress. The flaw affects all plugin versions up to and including 1.3.7. The root cause is insufficient input sanitization and output escaping on the auto_play_timeout parameter.

Authenticated attackers with Contributor-level access or higher can inject arbitrary web scripts. The injected payload executes in the browser of any user who visits the affected page.

Critical Impact

Stored XSS enables session hijacking, forced administrative actions, and account takeover through malicious JavaScript executing in privileged user browser sessions.

Affected Products

• WP Posts Carousel plugin for WordPress, all versions through 1.3.7
• WordPress sites permitting Contributor-level or higher user registration
• Any site rendering carousel content produced by the vulnerable plugin

Discovery Timeline

• 2025-03-01 - CVE-2025-1491 published to the National Vulnerability Database (NVD)
• 2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-1491

Vulnerability Analysis

The WP Posts Carousel plugin accepts a user-controlled auto_play_timeout parameter used to configure carousel behavior. The plugin fails to sanitize input before storage and does not escape the value when rendered in the page output. This dual failure allows arbitrary HTML and JavaScript to persist within WordPress content and execute on view.

Because the payload is stored server-side, exploitation is persistent. Every visitor loading the injected page triggers the attacker-supplied script under the site's origin.

An authenticated Contributor account is sufficient. WordPress Contributors can create posts but cannot publish them without review, which means an editor or administrator triggering script execution during review is a realistic attack path.

Root Cause

The plugin trusts the auto_play_timeout parameter as safe configuration data. It neither validates that the value is numeric nor applies output-escaping functions such as esc_attr() or esc_html() when emitting the value into HTML. This violates the WordPress plugin security guidance for input handling.

Attack Vector

Exploitation requires network access to a WordPress site and an authenticated account with Contributor-level privileges or above. The attacker submits a malicious payload through the auto_play_timeout parameter when configuring a carousel embedded in a post or page. When a reviewer, editor, or site visitor loads the resulting page, the script executes in their browser context. See the Wordfence Vulnerability Report and the WordPress Trac Changeset for technical details on the fix.

Detection Methods for CVE-2025-1491

Indicators of Compromise

• Unexpected <script> tags or event handlers such as onerror, onload, or onclick embedded in carousel-related post metadata.
• Non-numeric values stored in the auto_play_timeout field when the parameter should only accept an integer.
• Outbound requests from administrative browser sessions to unfamiliar domains after viewing posts containing carousels.
• New administrative user accounts or role changes shortly after an editor previewed a Contributor-submitted post.

Detection Strategies

• Audit WordPress postmeta and plugin option tables for auto_play_timeout values containing HTML tags, quotes, or JavaScript keywords.
• Enable Content Security Policy (CSP) reporting to surface inline script execution originating from carousel-rendered pages.
• Review web server logs for POST requests to plugin configuration endpoints from Contributor-role accounts.

Monitoring Recommendations

• Monitor privileged user sessions for anomalous DOM activity during post preview and review workflows.
• Alert on creation of WordPress administrator accounts or elevation of existing accounts following content review activity.
• Track installations of WP Posts Carousel across managed WordPress estates and flag versions at or below 1.3.7.

How to Mitigate CVE-2025-1491

Immediate Actions Required

• Update WP Posts Carousel to a version later than 1.3.7 that includes the fix referenced in the WordPress Trac Changeset 3248502.
• Audit existing carousel configurations for malicious content in the auto_play_timeout parameter and sanitize stored values.
• Review Contributor-level accounts and remove or restrict any that are unnecessary or unrecognized.

Patch Information

The vendor addressed the vulnerability in a release following 1.3.7. Refer to the WP Posts Carousel developer page for the current version and changelog. Applying the vendor patch is the definitive remediation.

Workarounds

• Deactivate the WP Posts Carousel plugin until an updated version is installed.
• Restrict user registration and remove Contributor-or-higher privileges from untrusted users.
• Deploy a Web Application Firewall (WAF) rule that blocks script-like payloads submitted to plugin configuration endpoints.
• Enforce a strict Content Security Policy that disallows inline scripts on WordPress front-end pages.

# Configuration example: enforce a strict CSP header via .htaccess
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'"