CVE-2026-42844 — HIGH (8.8)

Vulnerability 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 Score

8.8

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Getgrav	Grav	2.0.0

Related Weaknesses (CWE)

CWE-434 CWE-269

References

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

FAQ

What is CVE-2026-42844?

CVE-2026-42844 is a vulnerability with a CVSS score of 8.8 (HIGH). 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/accou...

How severe is CVE-2026-42844?

CVE-2026-42844 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-42844?

Check the references section above for vendor advisories and patch information. Affected products include: Getgrav Grav.