CVE-2021-47812 CRITICAL

CVE-2021-47812: GravCMS 1.10.7 - Arbitrary YAML Write/Update (Unauthenticated) (2)

Vendor Getgrav
Product GravCMS
Weakness CWE-862 · Missing authorization
Published January 15, 2026
Last update April 7, 2026

CVSS base score

9.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

What the vulnerability does

01Description

GravCMS 1.10.7 contains an unauthenticated vulnerability that allows remote attackers to write arbitrary YAML configuration and execute PHP code through the scheduler endpoint. Attackers can exploit the admin-nonce parameter to inject base64-encoded payloads and create malicious custom jobs with system command execution.

Key dates

02Disclosure timeline

January 15, 2026 CVE published
April 7, 2026 Record updated