CVE-2025-66303 json
Grav is vulnerable to a DOS on the admin panel
published 2025-12-01 11 mo ago modified 2026-09-26 44 d ago also EUVD-2025-200107 , GHSA-x62q-p736-3997
- cvss
- 4.9
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 36%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- packagist getgrav/grav 1.8.0-beta.27
- getgrav grav 1.8.0-beta.27
- getgrav grav_cms 1.8.0-beta.27
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 11 mo ago
Exploit prediction
0.41% chance of exploitation in the next 30 days, higher than 36% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/getgrav/grav/security/advisories/GHSA-x62q-p736-3997 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.9 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H |
| GitHub | 3.1 | 4.9 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | getgrav/grav | <1.8.0-beta.27 |
1.8.0-beta.27 |
Affected products
- getgrav grav
Classification
- Weakness
-
- CWE-400 Uncontrolled Resource Consumption
References
-
github.com
/getgrav/grav/commit/9d11094e4133f059688fad1e00dbe96fb6e3ead7
web, patch
-
github.com
/getgrav/grav/security/advisories/GHSA-x62q-p736-3997
exploit, web, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2025-66303
advisory
-
github.com
/getgrav/grav
package
Sources
- CVE List CVE-2025-66303
- GitHub Advisory GHSA-x62q-p736-3997
- NVD CVE-2025-66303
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.