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CVE-2025-66303

Grav is vulnerable to a DOS on the admin panel

Published: Dec 1, 2025Updated: Dec 3, 2025 Sources: CVE List NVD GHSACWE-400
NVD MITRE
4.9CVSSMEDIUM
EPSS Score
0.3%
Top 75.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:LPR:HUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-400

Affected Products

gravgetgrav
On-premCMS Plugin
Web & CMS Plugins / cms-core
getgrav/gravPackagistOSS Libraries
getgravoss-projectWeb & CMS Pluginsaka grav, grav-plugin-admin, getgrav/grav
packagistpackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/getgrav/grav/security/advisories/GHSA-x62q-p736-3997
github.com
https://github.com/getgrav/grav/commit/9d11094e4133f059688fad1e00dbe96fb6e3ead7
github.com
https://nvd.nist.gov/vuln/detail/CVE-2025-66303
nvd.nist.gov
and 1 more references View all →

Timeline

Published
Dec 1, 2025
Last Updated
Dec 3, 2025

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