CVE-2026-42844 PUBLISHED

Grav: Low-privileged API users can create super-admin accounts via blueprint-upload

Assigner: GitHub_M
Reserved: 30.04.2026 Published: 12.05.2026 Updated: 12.05.2026

Grav is a file-based Web platform. In Grav 2.0.0-beta.2, a low-privileged authenticated API user with api.media.write can abuse /api/v1/blueprint-upload to write an arbitrary YAML file into user/accounts/, then log in as the newly created account with api.super privileges. This results in full administrative compromise of the Grav API. This vulnerability is fixed in API 1.0.0-beta.17.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS Score: 8.7

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

Product Status

Vendor	getgrav
Product	grav
Versions	Version 2.0.0-beta.2 is affected

References

https://github.com/getgrav/grav/security/advisories/GHSA-6xx2-m8wv-756h

Problem Types

CWE-434: Unrestricted Upload of File with Dangerous Type CWE
CWE-269: Improper Privilege Management CWE