CVE-2026-42844
HIGHGrav: Low-privileged API users can create super-admin accounts via blueprint-upload
Title source: cnaExploitation Summary
EIP tracks 1 public exploit for CVE-2026-42844. PoCs published by dwisiswant0.
AI-analyzed exploit summary This repository contains a functional exploit for CVE-2026-42844, a vertical privilege escalation vulnerability in Grav CMS. The exploit leverages insufficient authorization checks in the API plugin's blueprint upload endpoint to create a super-admin account via a malicious YAML file.
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.
Exploits (1)
This repository contains a functional exploit for CVE-2026-42844, a vertical privilege escalation vulnerability in Grav CMS. The exploit leverages insufficient authorization checks in the API plugin's blueprint upload endpoint to create a super-admin account via a malicious YAML file.
References (1)
Scores
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H