CVE-2025-66302: Getgrav Grav Path Traversal Vulnerability

CVE-2025-66302 Overview

A path traversal vulnerability (CWE-22) has been identified in Grav CMS, a popular file-based Web platform. This vulnerability allows authenticated attackers with administrative privileges to read arbitrary files on the underlying server filesystem. The flaw arises due to insufficient input sanitization in the backup tool, where user-supplied paths are not properly restricted, enabling access to files outside the intended webroot directory.

With a CVSS score of 6.8 (Medium severity), this vulnerability poses a significant risk to organizations running vulnerable versions of Grav CMS. The impact depends on the privileges of the user account running the application, potentially exposing sensitive configuration files, credentials, and other critical system data.

Critical Impact

Authenticated administrators can exploit insufficient path validation in the backup tool to read sensitive files such as /etc/passwd, configuration files, and application secrets from the server filesystem.

Affected Products

• Grav CMS versions prior to 1.8.0-beta.27
• Grav CMS 1.8.0-beta1 through 1.8.0-beta26
• All stable releases prior to the security patch

Discovery Timeline

• 2025-12-01 - CVE-2025-66302 published to NVD
• 2025-12-03 - Last updated in NVD database

Technical Details for CVE-2025-66302

Vulnerability Analysis

This path traversal vulnerability exists in Grav CMS's backup functionality. The backup tool fails to properly sanitize user-supplied file paths, allowing attackers to use directory traversal sequences (such as ../) to escape the intended webroot directory and access arbitrary files on the server filesystem.

The CVSS vector CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N indicates:

• Attack Vector (AV:N): Network-accessible, exploitable remotely
• Attack Complexity (AC:L): Low complexity, easily reproducible
• Privileges Required (PR:H): High privileges (administrative access) required
• User Interaction (UI:N): No user interaction needed
• Scope (S:C): Changed scope - can affect resources beyond the vulnerable component
• Confidentiality Impact (C:H): High confidentiality impact
• Integrity Impact (I:N): No integrity impact
• Availability Impact (A:N): No availability impact

The EPSS score of 0.046% places this vulnerability at the 14.24th percentile, indicating a relatively low probability of exploitation in the wild, likely due to the requirement for authenticated administrative access.

Root Cause

The root cause of CVE-2025-66302 is inadequate input validation in the backup tool's file path handling logic. When processing backup requests, the application fails to:

1. Properly canonicalize file paths before processing
2. Validate that resolved paths remain within the allowed webroot directory
3. Strip or reject directory traversal sequences from user input

This allows crafted path inputs containing sequences like ../ to traverse outside the intended directory structure, bypassing the application's file access restrictions.

Attack Vector

The attack requires the attacker to have authenticated administrative access to the Grav CMS instance. Once authenticated, the attacker can manipulate file path parameters in the backup tool functionality to include directory traversal sequences. The server then processes these malicious paths, reading files from locations outside the webroot.

The vulnerability is exploitable over the network without user interaction, making it particularly dangerous in environments where administrative credentials may have been compromised or where insider threats exist. Due to the Changed Scope (S:C), successful exploitation can impact resources beyond the Grav CMS application itself, potentially exposing system-level files and configurations.

For technical details and proof-of-concept information, see the security advisory at: https://github.com/getgrav/grav/security/advisories/GHSA-j422-qmxp-hv94

Detection Methods for CVE-2025-66302

Indicators of Compromise

• Unusual file access patterns in web server logs targeting backup functionality
• Requests containing path traversal sequences (../, ..%2f, %2e%2e/) in backup-related endpoints
• Access attempts to sensitive system files such as /etc/passwd, /etc/shadow, or application configuration files
• Administrative session activity followed by anomalous file read operations

Detection Strategies

Organizations should implement multiple layers of detection to identify exploitation attempts:

1. Web Application Firewall (WAF) Rules: Configure WAF rules to detect and block requests containing directory traversal patterns in backup-related URL parameters and request bodies.

2. Log Analysis: Monitor web server and application logs for requests to backup endpoints containing suspicious path patterns. Look for encoded traversal sequences that may bypass basic filtering.

3. File Integrity Monitoring: While this vulnerability doesn't modify files, monitoring access patterns to sensitive system files can indicate exploitation attempts.

4. SentinelOne Singularity Platform: Leverage behavioral AI to detect anomalous file access patterns originating from web application processes, particularly reads of sensitive system configuration files.

Monitoring Recommendations

• Enable detailed access logging for the Grav CMS admin panel
• Implement alerting for backup operations that reference paths outside the webroot
• Monitor for unusual administrative session activity, especially from unfamiliar IP addresses
• Configure SIEM rules to correlate admin login events with sensitive file access attempts
• Deploy endpoint detection to identify web server processes accessing files they shouldn't normally access

How to Mitigate CVE-2025-66302

Immediate Actions Required

• Upgrade Grav CMS to version 1.8.0-beta.27 or later immediately
• Audit administrative user accounts and remove unnecessary privileges
• Review server logs for evidence of prior exploitation attempts
• Implement Web Application Firewall rules to block path traversal attempts
• Restrict network access to the Grav CMS admin panel to trusted IP ranges

Patch Information

The vulnerability has been fixed in Grav CMS version 1.8.0-beta.27. The security patch is available through the official GitHub repository:

• Patch Commit: ed640a13143c4177af013cf001969ed2c5e197ee
• Repository: https://github.com/getgrav/grav/commit/ed640a13143c4177af013cf001969ed2c5e197ee

Organizations should prioritize upgrading to the patched version. For production environments, consider testing the update in a staging environment before deployment to ensure compatibility.

Workarounds

If immediate patching is not possible, implement the following temporary mitigations:

1. Restrict Admin Access: Limit administrative access to the Grav CMS instance to only essential personnel and trusted networks.

2. Web Server Configuration: Configure your web server to reject requests containing path traversal sequences at the server level before they reach the application.

3. Network Segmentation: Isolate the Grav CMS server to minimize the impact of potential file disclosure.

4. Principle of Least Privilege: Ensure the web server process runs with minimal filesystem permissions, limiting which files can be read even if the vulnerability is exploited.

# Example: Restrict admin panel access by IP in Apache
<Directory "/path/to/grav/admin">
    Require ip 192.168.1.0/24
    Require ip 10.0.0.0/8
</Directory>

# Example: Block path traversal in nginx
location /admin {
    if ($request_uri ~* "\.\.") {
        return 403;
    }
    # Additional configuration...
}