CVE-2021-47812 | GravCMS 1.10.7 contains an unauthenticated vulnerability tha… | CVSS 9.8 CRITICAL

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.

Metadata

CVE ID: CVE-2021-47812
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-01-14 17:11 UTC
Published: 2026-01-15 23:25 UTC
Last updated: 2026-04-07 14:06 UTC
Primary CWE: CWE-862
Missing Authorization
Vendor / Product: Getgrav / GravCMS
Sources: cve.org · NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: yes
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
Getgrav	GravCMS	—	1.10.7

Weakness (CWE)

CWE	Source	Description
CWE-862	cna	Missing Authorization

CVSS scores (2)

Score	Severity	Version	Source	Vector
9.8	CRITICAL	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3	CRITICAL	4.0	cna	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

References (3)

ExploitDB-49973 https://www.exploit-db.com/exploits/49973
Official Grav CMS Homepage https://getgrav.org
VulnCheck Advisory: GravCMS 1.10.7 - Arbitrary YAML Write/Update (Unauthenticated) (2) https://www.vulncheck.com/advisories/gravcms-arbitrary-yaml-writeupdate-unauthenticated