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

May 6, 2026 (updated May 13, 2026)

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.

References

github.com/advisories/GHSA-6xx2-m8wv-756h
github.com/getgrav/grav-plugin-api/commit/97fc02844a35f743dfe93d34efd92d47eedd5bc5
github.com/getgrav/grav/security/advisories/GHSA-6xx2-m8wv-756h
nvd.nist.gov/vuln/detail/CVE-2026-42844

Code Behaviors & Features

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