CVE-2025-23977: Post Carousel Slider CSRF Vulnerability

CVE-2025-23977 Overview

CVE-2025-23977 is a Cross-Site Request Forgery (CSRF) vulnerability in the Post Carousel Slider WordPress plugin developed by Bhaskar Dhote. This vulnerability allows attackers to chain CSRF with Stored Cross-Site Scripting (XSS), enabling malicious actors to inject persistent scripts into affected WordPress sites by tricking authenticated administrators into performing unintended actions.

Critical Impact

Attackers can exploit this CSRF vulnerability to inject malicious scripts that persist in the WordPress database, potentially compromising all site visitors and administrators who view affected pages.

Affected Products

• Post Carousel Slider WordPress Plugin version 2.0.1 and earlier
• All WordPress installations using the vulnerable plugin versions

Discovery Timeline

• 2025-01-31 - CVE-2025-23977 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-23977

Vulnerability Analysis

This vulnerability combines two attack vectors: Cross-Site Request Forgery (CSRF) and Stored Cross-Site Scripting (XSS). The Post Carousel Slider plugin fails to implement proper CSRF token validation on sensitive administrative functions, allowing attackers to craft malicious requests that execute in the context of authenticated administrators. When combined with insufficient input sanitization, this enables the injection of persistent malicious scripts into the WordPress database.

The attack requires user interaction—specifically, an authenticated administrator must visit a malicious page or click a crafted link. Once triggered, the vulnerability allows script injection that affects all subsequent visitors to the compromised pages, creating a persistent threat vector within the WordPress installation.

Root Cause

The root cause of CVE-2025-23977 lies in the plugin's failure to implement proper security controls on form submissions and administrative actions. Specifically:

1. Missing CSRF Token Validation: The plugin does not verify WordPress nonces on critical form submissions, allowing cross-origin requests to be processed as legitimate.

2. Insufficient Input Sanitization: User-supplied input is not properly sanitized before being stored in the database, enabling the persistence of malicious JavaScript payloads.

3. Lack of Output Encoding: When stored data is rendered, it is not properly escaped, allowing stored XSS payloads to execute in visitors' browsers.

Attack Vector

The attack exploits the network-accessible plugin functionality through the following mechanism:

1. Reconnaissance: The attacker identifies WordPress sites running the vulnerable Post Carousel Slider plugin (<= 2.0.1)

2. Payload Crafting: A malicious HTML page is created containing a hidden form that submits to the plugin's administrative endpoint with XSS payload data

3. Social Engineering: The attacker tricks an authenticated WordPress administrator into visiting the malicious page

4. CSRF Execution: The administrator's browser automatically submits the forged request with their session credentials

5. XSS Injection: The malicious script is stored in the WordPress database without proper sanitization

6. Payload Delivery: All users visiting pages with the carousel slider have the malicious script executed in their browser context

The attack requires no prior authentication from the attacker, only that the victim administrator is logged into their WordPress dashboard. For detailed technical information, refer to the Patchstack Vulnerability Analysis.

Detection Methods for CVE-2025-23977

Indicators of Compromise

• Unexpected JavaScript code in carousel slider database entries or plugin settings
• Unusual outbound requests from visitor browsers to unknown external domains
• Modified plugin configuration without administrator action
• Browser developer console showing script errors from unfamiliar sources on pages containing carousel sliders

Detection Strategies

• Review WordPress database tables associated with the Post Carousel Slider plugin for suspicious script tags or encoded JavaScript
• Monitor web server access logs for POST requests to plugin administrative endpoints from unusual referrers
• Implement Content Security Policy (CSP) headers and monitor for CSP violation reports
• Use WordPress security plugins to scan for unauthorized modifications to plugin data

Monitoring Recommendations

• Enable WordPress audit logging to track all plugin configuration changes
• Configure web application firewall (WAF) rules to detect and block CSRF and XSS attack patterns
• Implement real-time file integrity monitoring on WordPress installations
• Set up alerts for unusual administrative activity patterns

How to Mitigate CVE-2025-23977

Immediate Actions Required

• Update the Post Carousel Slider plugin to a patched version if available from the WordPress plugin repository
• If no patch is available, deactivate and remove the Post Carousel Slider plugin until a security update is released
• Review and clean any existing carousel slider configurations for injected malicious content
• Force logout all WordPress administrative sessions and require password resets

Patch Information

Organizations should check the official WordPress plugin repository for updated versions of the Post Carousel Slider plugin that address this vulnerability. The Patchstack vulnerability database provides additional guidance on remediation status.

Workarounds

• Implement a Web Application Firewall (WAF) with rules to block CSRF and XSS attack patterns targeting WordPress plugins
• Restrict administrative access to WordPress using IP allowlisting or VPN requirements
• Add custom CSRF protection by implementing additional nonce verification through a security plugin
• Disable the plugin entirely if it is not critical to site functionality

# WordPress CLI commands to disable the vulnerable plugin
wp plugin deactivate post-carousel-slider --path=/var/www/html/wordpress

# Verify plugin status
wp plugin status post-carousel-slider --path=/var/www/html/wordpress

# Check for available updates
wp plugin update --all --dry-run --path=/var/www/html/wordpress