CVE-2026-42844 HIGH

CVE-2026-42844: Grav: Low-privileged API users can create super-admin accounts via blueprint-upload

Vendor Getgrav
Product grav
Weakness CWE-434 · Unrestricted file upload
Published May 12, 2026
Last update May 13, 2026
View on NVD All CVEs

CVSS base score

8.7/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality —
Integrity —

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 12, 2026 CVE published
May 13, 2026 Record updated