Home

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.

PUBLISHED Reserved 2026-04-30 | Published 2026-05-12 | Updated 2026-05-13 | Assigner GitHub_M




HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-434: Unrestricted Upload of File with Dangerous Type

CWE-269: Improper Privilege Management

Product status

2.0.0-beta.2
affected

References

github.com/...v/grav/security/advisories/GHSA-6xx2-m8wv-756h exploit

github.com/...v/grav/security/advisories/GHSA-6xx2-m8wv-756h

cve.org (CVE-2026-42844)

nvd.nist.gov (CVE-2026-42844)

Download JSON