CVE-2026-42844 Grav: Low-privileged API users can create super-admin accounts via blueprint-upload
Low-privileged API users can create super-admin accounts by uploading arbitrary YAML files, leading to full administrative compromise.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-42844?
CVE-2026-42844 is a high-severity vulnerability in Getgrav Grav, published on 12 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-42844?
2 open source packages ship an affected version, including getgrav/grav. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
getgrav/grav Packagist | All versions | 2.0.0-beta.4 |
getgrav/grav Packagist | All versions | 2.0.0-beta.4 |
Products include Getgrav Grav.
How do I fix CVE-2026-42844?
Upgrade getgrav/grav to 2.0.0-beta.4 or later.
Is CVE-2026-42844 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42844 exists.
Other vulnerabilities in Getgrav Grav
- CVE-2023-34251 Grav Server Side Template Injection vulnerability
- CVE-2025-46199 Cross-site scripting in n/a
- CVE-2021-47812 GravCMS 1.10.7 - Arbitrary YAML Write/Update (Unauthenticated) (2)
- CVE-2025-66844 Grav may be vulnerable to SSRF attack via Twig Templates
- CVE-2022-2073 Code Injection in getgrav/grav
Sources
Also known as GHSA-6xx2-m8wv-756h.