CVE-2026-42844

High

Description

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.

SeverityHigh

CVSS8.8

Exploit probability—

Product

Grav

PublishedMay 12, 2026

First seenMay 12, 2026

Weakness typeCWE-434Unrestricted upload of dangerous file type CWE-269Improper privilege management

How to fix

Update

getgrav/grav2.0.0-beta.4 or later

Affected products

Product	Affected versions	Fixed in
getgrav grav	2.0.0	—
getgrav/gravPackagist	v < 2.0.0-beta.4	2.0.0-beta.4

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