Unauthenticated Remote Code Execution in GravCMS by Grav
CVE-2021-47812

9.3CRITICAL

Key Information:

Vendor

Getgrav

Status
Gravcms
Vendor
CVE Published:
15 January 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2021-47812?

GravCMS version 1.10.7 is vulnerable to an unauthenticated flaw that enables remote attackers to exploit the scheduler endpoint. By manipulating the admin-nonce parameter, attackers can inject base64-encoded payloads to create malicious custom jobs. This compromise permits the execution of arbitrary PHP code on the server, potentially leading to unauthorized access and control over the system's operations.

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Affected Version(s)

GravCMS 1.10.7

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2021-47812 - Proof of Concept

References

https://www.exploit-db.com/exploits/49973
exploit
https://getgrav.org
product
https://www.vulncheck.com/advisories/gravcms-arbitrary-ya...
third-party-advisory

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

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