CVE-2025-66301Public exploitNetwork attack vector

Editor form-process takeover via unchecked YAML frontmatter

Published Dec 1, 2025 · Updated Dec 2, 2025

Improper authorization in GetGrav Grav before 1.8.0-beta.27 allows remote authenticated users to alter form processing through page edits. The POST /admin/pages/{page_name} handler accepts data[_json][header][form] YAML frontmatter, including its process section, without enforcing field-level editor permissions. An account with page-editing rights can change redirects, email actions, or templates and can chain the change with Twig injection to execute code.

CVSS severity8.6
High
EPSS probability1.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in GetGrav Grav before 1.8.0-beta.27 allows remote authenticated users to alter form processing through page edits. The POST /admin/pages/{page_name} handler accepts data[_json][header][form] YAML frontmatter, including its process section, without enforcing field-level editor permissions. An account with page-editing rights can change redirects, email actions, or templates and can chain the change with Twig injection to execute code.

The record

CVE
CVE-2025-66301
Published
Dec 1, 2025
Updated
Dec 2, 2025
Vendor
GetGrav
Product
Grav
Classifications
CWE-285, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 2, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.8.0-beta.27

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GetGrav · Gravversion=< 1.8.0-beta.27

Published CVSS scores

9.6NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
8.6GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-285Improper Authorization
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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