Auth bypass in Getgrav Grav
CVE-2026-42609
Grav is a file-based Web platform. Prior to 2.0.0-beta.2, a business logic vulnerability in the Grav Admin Panel allows a low-privileged user (with only user creation permissions) to overwrite existing accounts, including the primary administrator. By creating a new user with a username that already exists, the system updates the existing account's metadata and permissions instead of rejecting the request. This leads to a Denial of Service (DoS) on administrative functions and Privilege De-escalation of the root account. This vulnerability is fixed in 2.0.0-beta.2.
Vulnerability class: Privilege Escalation
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (46.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · 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-rr73-568v-28f8 (Exploit, Patch, Vendor Advisory)
- github.com/getgrav/grav/commit/5a12f9be8314682c8713e569e330f11805d0a663 (Patch)
- github.com/getgrav/grav/commit/c66dfeb5ff679a1667678c6335eb9ff3255dfc47 (Patch)
- github.com/getgrav/grav/commit/d904efc33e03ebb597afde8d3368b28cf0423632 (Patch)
Frequently asked questions
- What is CVE-2026-42609?
- CVE-2026-42609 is a high-severity vulnerability in Getgrav Grav, classified under Improper Privilege Management. CVSS score: 8.1/10. Published 2026-05-11.
- How severe is CVE-2026-42609?
- High severity. CVSS v3 base score is 8.1 out of 10.