CVE-2021-47812

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.

• https://getgrav.org
• https://www.exploit-db.com/exploits/49973
• https://www.vulncheck.com/advisories/gravcms-arbitrary-yaml-writeupdate-unauthenticated