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

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-05-12 · updated 2026-10-26
Weakness: CWE-269

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.

Affected products

getgrav grav: 2.0.0-beta2

References

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

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