PHP
CVE-2021-47812
CRITICAL
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
GravCMS 1.10.7 allows unauthenticated remote attackers to write arbitrary YAML configuration files, leading to full server compromise through admin account creation or code execution.
Technical ContextAI
GravCMS 1.10.7 exposes an endpoint without authentication checks (CWE-862) that processes user-supplied YAML content and writes it to the server's configuration directory. Since Grav uses YAML files for user accounts and system config, this enables creating admin accounts.
RemediationAI
Upgrade GravCMS immediately. Restrict write access to configuration directories at the web server level.
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Same weakness CWE-862 – Missing Authorization
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External POC / Exploit Code
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