CVE-2026-42844

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

State: Published
Severity: 8.7 High
Published: May 12, 2026
Updated: May 13, 2026
Reserved: Apr 30, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	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	GitHub_M

Weaknesses

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

Affected Products

Product	Versions
gravgetgrav	2.0.0-beta.2Affected

References

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

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