Resource exhaustion in Getgrav Grav
CVE-2025-66303
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.
Vulnerability class: DoS (Denial of Service)
EPSS: 0.003 (27.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Getgrav Grav — versions 1.8.0, < 1.8.0-beta.27
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Third Party Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-66303?
- CVE-2025-66303 is a medium-severity vulnerability in Getgrav Grav, classified under Uncontrolled Resource Consumption. CVSS score: 4.9/10. Published 2025-12-01.
- How severe is CVE-2025-66303?
- Medium severity. CVSS v3 base score is 4.9 out of 10.