CVE-2025-66303
MEDIUM EPSS 25.1%
Published Dec 1, 20257mo ago · Modified Jun 17, 20262w ago
4.9 CVSS 3.1
Published Dec 1, 2025 7mo ago
Last Modified Jun 17, 2026 2w ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H Attack Vector Network
Attack Complexity Low
Privileges Required High
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High
Threat Intelligence
EPSS Exploit Probability
25.1% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available
Weaknesses 1
CWE-400 Uncontrolled Resource Consumption Resource Mgmt
Affected Products 27
| Vendor | Product | Version | Range |
|---|---|---|---|
| getgrav | grav | * | <1.8.0 |
| getgrav | grav | 1.8.0 | any |
| getgrav | grav | 1.8.0 | any |
| getgrav | grav | 1.8.0 | any |
| getgrav | grav | 1.8.0 | any |
| getgrav | grav | 1.8.0 | any |
| getgrav | grav | 1.8.0 | any |
| getgrav | grav | 1.8.0 | any |
| getgrav | grav | 1.8.0 | any |
| getgrav | grav | 1.8.0 | any |
| getgrav | grav | 1.8.0 | any |
| getgrav | grav | 1.8.0 | any |
| getgrav | grav | 1.8.0 | any |
| getgrav | grav | 1.8.0 | any |
| getgrav | grav | 1.8.0 | any |
| getgrav | grav | 1.8.0 | any |
| getgrav | grav | 1.8.0 | any |
| getgrav | grav | 1.8.0 | any |
| getgrav | grav | 1.8.0 | any |
| getgrav | grav | 1.8.0 | any |
| getgrav | grav | 1.8.0 | any |
| getgrav | grav | 1.8.0 | any |
| getgrav | grav | 1.8.0 | any |
| getgrav | grav | 1.8.0 | any |
| getgrav | grav | 1.8.0 | any |
| getgrav | grav | 1.8.0 | any |
| getgrav | grav | 1.8.0 | any |
References 2
- github.com https://github.com/getgrav/grav/commit/9d11094e4133f059688fad1e00dbe96fb6e3ead7
- github.com https://github.com/getgrav/grav/security/advisories/GHSA-x62q-p736-3997
Remediation
- github.com https://github.com/getgrav/grav/commit/9d11094e4133f059688fad1e00dbe96fb6e3ead7