Overview
CVE-2025-66298 describes a Server-Side Template (SST) vulnerability discovered in Grav, a file-based Web platform. Prior to version 1.8.0-beta.27, a simple form on a Grav site could be exploited to reveal the entire Grav configuration details, including sensitive plugin configurations. This was achieved by crafting a specific POST payload that triggered the SST vulnerability. This vulnerability has been patched in Grav version 1.8.0-beta.27.
Published: 2025-12-01T22:15:49.103
Technical Details
The vulnerability resides in how Grav processes form data within its templating engine. By manipulating the POST data submitted through a form, an attacker can inject malicious template code that, when processed by the server, exposes the contents of configuration files. This includes details such as database credentials, API keys, and other sensitive settings defined within Grav’s configuration.
The specific attack vector involves exploiting the server’s template engine to execute code that reads and outputs the contents of configuration files. The /config directory and its associated files are particularly vulnerable.
CVSS Analysis
Unfortunately, the CVSS score and severity are currently unavailable (N/A) for CVE-2025-66298. However, the potential impact of configuration exposure suggests a high-severity rating would be appropriate, depending on the sensitivity of the data exposed. A future analysis may provide more specific CVSS details.
Possible Impact
The exploitation of CVE-2025-66298 can have severe consequences:
- Full Site Compromise: Exposed database credentials can allow an attacker to gain full control over the website’s database.
- Data Breach: Sensitive user data or other proprietary information stored in the database could be stolen.
- Account Takeover: Exposed API keys or authentication tokens could allow attackers to gain unauthorized access to other services connected to the Grav site.
- Privilege Escalation: Depending on the configuration, exposed credentials might allow attackers to escalate privileges within the system.
- Malware Deployment: With compromised credentials, an attacker could inject malicious code into the website.
Mitigation and Patch Steps
The primary mitigation step is to upgrade your Grav installation to version 1.8.0-beta.27 or later. This version contains the necessary patch to address the SST vulnerability.
- Upgrade Grav: Update your Grav installation to version 1.8.0-beta.27 or a later stable release. This is the most effective way to address the vulnerability. Follow the official Grav upgrade instructions.
- Review Configuration: After upgrading, review your Grav configuration files to ensure no sensitive information has been compromised.
- Monitor for Suspicious Activity: Monitor your server logs for any signs of suspicious activity, such as unauthorized access attempts or unusual file modifications.
- Web Application Firewall (WAF): Implement a Web Application Firewall (WAF) to filter out malicious requests that might attempt to exploit the vulnerability. Configure the WAF with rules that detect and block SSTI attempts.
