High severity · published May 12, 2026
CVE-2026-42844
Grav: Low-privileged API users can create super-admin accounts via blueprint-upload
8.8
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 27% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GR
grav · getgrav
2.0.0-beta.2 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-42844
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-42844
Exploit
https://github.com/getgrav/grav/security/advisories/GHSA-6xx2-m8wv-756h
More from grav
9.9
CVE-2024-34082
Grav is a file-based Web platform
9.8
CVE-2026-80203
Grav before 1.0.18 Authentication Bypass via Scoped API Key
9.8
CVE-2026-56710
Grav Login Plugin before 1.0.16 Privilege Escalation via Unlock
9.8
CVE-2026-65008
Grav before 2.0.7 Remote Code Execution via Blueprint dynamicData
9.8
CVE-2021-47812
GravCMS 1.10.7 - Arbitrary YAML Write/Update (Unauthenticated) (2)