CVE-2026-24635: EduBlink Core File Inclusion Vulnerability

CVE-2026-24635 Overview

CVE-2026-24635 is a Local File Inclusion (LFI) vulnerability affecting the EduBlink Core WordPress plugin developed by DevsBlink. The vulnerability stems from improper control of filename parameters used in PHP include/require statements, allowing authenticated attackers with low privileges to include arbitrary local files on the server. This can lead to sensitive information disclosure, configuration file exposure, and potentially escalate to remote code execution through log poisoning or other LFI-to-RCE techniques.

Critical Impact

Authenticated attackers can leverage this LFI vulnerability to read sensitive server files, potentially exposing database credentials, WordPress configuration secrets, and other critical system information that could lead to full site compromise.

Affected Products

• DevsBlink EduBlink Core plugin version 2.0.7 and earlier
• WordPress installations using the edublink-core plugin
• Educational and e-learning platforms built on EduBlink theme

Discovery Timeline

• 2026-01-23 - CVE CVE-2026-24635 published to NVD
• 2026-01-26 - Last updated in NVD database

Technical Details for CVE-2026-24635

Vulnerability Analysis

This vulnerability is classified under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program), commonly known as PHP Remote File Inclusion, though in this case it manifests as a Local File Inclusion vulnerability. The EduBlink Core plugin fails to properly sanitize user-supplied input before using it in PHP include() or require() statements.

When an authenticated user with low privileges submits a crafted request containing path traversal sequences, the application processes the malicious filename without adequate validation. This allows attackers to traverse the directory structure and include arbitrary PHP files or read sensitive files from the server's filesystem.

The network-accessible nature of this vulnerability combined with authentication requirements creates a moderate attack complexity scenario. Successful exploitation requires valid user credentials but does not require administrative privileges, making it exploitable by any authenticated user on a vulnerable WordPress site.

Root Cause

The root cause of this vulnerability lies in insufficient input validation and sanitization within the EduBlink Core plugin's file handling routines. The plugin accepts user-controlled input that specifies filenames for PHP include operations without properly validating or restricting the input to safe values. The absence of allowlist-based validation, path canonicalization, or proper input filtering allows attackers to inject directory traversal sequences such as ../ to escape the intended directory and access arbitrary files on the system.

Attack Vector

The attack is conducted over the network against WordPress installations running vulnerable versions of the EduBlink Core plugin. An attacker must first obtain valid authentication credentials for the WordPress site, even at a low privilege level such as subscriber or contributor roles.

Once authenticated, the attacker can craft malicious HTTP requests containing path traversal payloads targeting the vulnerable file inclusion functionality. The payload typically includes sequences like ../../../ to navigate up the directory tree and access sensitive files such as /etc/passwd, wp-config.php, or other configuration files containing credentials and secrets.

The vulnerability mechanism involves unsanitized user input being passed directly to PHP file inclusion functions. For detailed technical analysis and exploitation patterns, refer to the Patchstack Vulnerability Report.

Detection Methods for CVE-2026-24635

Indicators of Compromise

• HTTP requests containing path traversal sequences (../, ..%2f, ..%5c) targeting EduBlink Core plugin endpoints
• Unusual file access patterns in web server logs, particularly requests attempting to access /etc/passwd, wp-config.php, or log files
• Authentication events followed by suspicious plugin-related requests from the same session
• Error logs showing failed file inclusion attempts or PHP warnings related to file paths

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block path traversal patterns in request parameters
• Monitor access logs for requests containing encoded or unencoded directory traversal sequences
• Implement file integrity monitoring on critical WordPress configuration files
• Use SentinelOne Singularity Platform to detect suspicious PHP process behavior and file access patterns

Monitoring Recommendations

• Enable verbose logging for the EduBlink Core plugin and related WordPress components
• Configure alerting for any authenticated user attempting to access files outside the plugin's designated directories
• Monitor for unusual outbound connections from the web server that could indicate post-exploitation data exfiltration
• Regularly audit user accounts and remove unnecessary low-privilege accounts that could be leveraged in attacks

How to Mitigate CVE-2026-24635

Immediate Actions Required

• Update the EduBlink Core plugin to the latest patched version as soon as a fix is available from DevsBlink
• Review and audit all user accounts on affected WordPress installations, removing unnecessary accounts
• Implement WAF rules to block path traversal attempts targeting the plugin
• Monitor logs for any evidence of prior exploitation attempts

Patch Information

As of the last NVD update on 2026-01-26, organizations should check for updates from DevsBlink for the EduBlink Core plugin. The vulnerability affects versions through 2.0.7, so users should update to any version newer than 2.0.7 once released. Monitor the Patchstack Vulnerability Report for patch availability announcements.

Workarounds

• Temporarily disable the EduBlink Core plugin if it is not critical to site functionality until a patch is available
• Implement server-level restrictions using open_basedir PHP directive to limit file access scope
• Deploy ModSecurity or similar WAF with rules blocking LFI attack patterns
• Restrict plugin functionality to only trusted administrative users through WordPress capability management

# Apache .htaccess configuration to block path traversal attempts
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{QUERY_STRING} (\.\./|\.\.\\) [NC,OR]
RewriteCond %{QUERY_STRING} (\.\.%2f|\.\.%5c) [NC]
RewriteRule .* - [F,L]
</IfModule>

# PHP open_basedir restriction in php.ini or .user.ini
# open_basedir = /var/www/html/:/tmp/