CVE-2025-66303: getgrav grav Uncontrolled Resource Consumption

Vulnerability summary

CVE-2025-66303 is a medium (CVSS 4.9) Uncontrolled Resource Consumption vulnerability in getgrav grav. EPSS estimates a 0.39% chance of exploitation in the next 30 days, higher than 31.3% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 01-12-2025
   PublishedVulnerability first disclosed.
2. 03-12-2025
   Last modifiedVulnerability information updated.

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.

• CWE-400Uncontrolled Resource ConsumptionThe product does not properly control the allocation and maintenance of a limited resource.