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CVE-2025-66303

4.9 · MEDIUM

Grav is a file-based Web platform.

Published Dec 1, 2025CWE-400EPSS 0.39%

Overview

CVE-2025-66303 is a medium-severity vulnerability. 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, patches, and mitigation guidance. 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.

References

GitHubgithub.com/getgrav/grav/commit/9d11094e4133f059688fad1e00dbe96fb6e3ead7GitHubgithub.com/getgrav/grav/security/advisories/GHSA-x62q-p736-3997GitHubgithub.com/getgrav/grav/security/advisories/GHSA-x62q-p736-3997

How CyberStrike helps

Frequently asked questions

What is CVE-2025-66303?

CVE-2025-66303 is a medium-severity vulnerability. 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, patches, and mitigation guidance. 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 is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-66303 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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