CVE-2021-47812
GravCMS 1.10.7 - Arbitrary YAML Write/Update (Unauthenticated) (2)
- State
- Published
- Severity
- 9.3 Critical
- Published
- Jan 15, 2026
- Updated
- Apr 7, 2026
- Reserved
- Jan 14, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.3 Critical | 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 | VulnCheck |
| 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-862 Missing Authorization
Affected Products
| Product | Versions |
|---|---|
GravCMSGetgrav |
|
References
- ExploitDB-49973exploit
- Official Grav CMS Homepageproduct
- VulnCheck Advisory: GravCMS 1.10.7 - Arbitrary YAML Write/Update (Unauthenticated) (2)third-party-advisory
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