What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-01-16 · updated 2026-06-17
• Weakness: CWE-862

Description

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.

Affected products

• getgrav grav: 1.10.7

References

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

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