Critical severity · published Dec 1, 2025
CVE-2025-66301
Grav ihas Broken Access Control which allows an Editor to modify the page's YAML Frontmatter to alter form processing actions
9.6
CVSS
1.3%
EPSS
No
On KEV
Description
Grav is a file-based Web platform. Prior to 1.8.0-beta.27, due to improper authorization checks when modifying critical fields on a POST request to /admin/pages/{page_name}, an editor with only permissions to change basic content on the form is now able to change the functioning of the form through modifying the content of the data[_json][header][form] which is the YAML frontmatter which includes the process section which dictates what happens after a user submits the form which include some important actions that could lead to further vulnerabilities. This vulnerability is fixed in 1.8.0-beta.27.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)1.3% · higher than 71% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GR
grav · getgrav
< 1.8.0-beta.27 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-66301
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-66301
Exploit
https://github.com/getgrav/grav/security/advisories/GHSA-v8x2-fjv7-8hjh
More from grav
9.9
CVE-2024-34082
Grav is a file-based Web platform
9.8
CVE-2026-80203
Grav before 1.0.18 Authentication Bypass via Scoped API Key
9.8
CVE-2026-56710
Grav Login Plugin before 1.0.16 Privilege Escalation via Unlock
9.8
CVE-2026-65008
Grav before 2.0.7 Remote Code Execution via Blueprint dynamicData
9.8
CVE-2021-47812
GravCMS 1.10.7 - Arbitrary YAML Write/Update (Unauthenticated) (2)