What is CVE-2026-42844?

CVE-2026-42844 is a high-severity vulnerability in Getgrav Grav, classified under Improper Privilege Management. CVSS score: 8.8/10. Published 2026-05-12.

How severe is CVE-2026-42844?

High severity. CVSS v3 base score is 8.8 out of 10.

Privilege escalation in Getgrav Grav

CVE-2026-42844

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.

Vulnerability class: Privilege Escalation

Published 2026-05-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.005 (38.9th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 38.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.001

Affected products

Getgrav Grav — versions 2.0.0-beta.2, 2.0.0

Weakness classification (CWE)

References

github.com/getgrav/grav/security/advisories/GHSA-6xx2-m8wv-756h (Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-42844?: CVE-2026-42844 is a high-severity vulnerability in Getgrav Grav, classified under Improper Privilege Management. CVSS score: 8.8/10. Published 2026-05-12.
How severe is CVE-2026-42844?: High severity. CVSS v3 base score is 8.8 out of 10.