CVE-2025-66303
4.9 · MEDIUMOverview
CVE-2025-66303 is a medium-severity vulnerability affecting getgrav grav. It was published on December 1, 2025 and has a CVSS 3.1 base score of 4.9 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 4.9, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical Description
Grav is a file-based Web platform. Prior to 1.8.0-beta.27, A Denial of Service (DoS) vulnerability has been identified in Grav related to the handling of scheduled_at parameters. Specifically, the application fails to properly sanitize input for cron expressions. By manipulating the scheduled_at parameter with a malicious input, such as a single quote, the application admin panel becomes non-functional, causing significant disruptions to administrative operations. The only way to recover from this issue is to manually access the host server and modify the backup.yaml file to correct the corrupted cron expression. This vulnerability is fixed in 1.8.0-beta.27.
Remediation
Check the references section for vendor advisories and patches from getgrav. Update grav to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| getgrav | grav | >= 0, < 1.8.0 | Affected |
Frequently Asked Questions
What is CVE-2025-66303?
CVE-2025-66303 is a medium-severity vulnerability affecting getgrav grav. It was published on December 1, 2025 and has a CVSS 3.1 base score of 4.9 (MEDIUM).
How severe is CVE-2025-66303?
This vulnerability has a CVSS 3.1 base score of 4.9, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2025-66303?
Check the references section for vendor advisories and patches from getgrav. Update grav to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2025-66303?
CyberStrike's AI-powered security agents can automatically detect CVE-2025-66303 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
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