Auth bypass in Getgrav Grav
CVE-2026-100670
Grav CMS 2.0.14 through 2.0.24 contains a privilege escalation vulnerability in the group and account blueprints. The access map is gated by a `security@: admin.super` guard that is resolved by the field's exact path, so a submitted flat dot-notation key such as `access.admin.super` (instead of the nested `access[admin][super]`) matches no blueprint rule, survives BlueprintSchema::filterArray() and flattening, and is written by FlexObject::update() via setNestedProperty(), which splits on `.` and reconstructs the nested value. An authenticated backend operator using the flex accounts backend who holds admin.users but not admin.super can therefore grant admin.super to their own account or to a group they belong to and escalate to full super-admin, gaining control over configuration, plugin and theme installation, the file manager, and all accounts. Fixed in 2.0.25, which drops any dotted key whose ancestor path is disabled or marked validate.ignore.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
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
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/getgrav/grav/security/advisories/GHSA-mwjj-r7vm-pgqm (vendor-advisory)
- www.vulncheck.com/advisories/grav-cms-2.0.14-through-2.0.24-privilege-escalatio… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100670?
- CVE-2026-100670 is a high-severity vulnerability in Getgrav Grav, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.8/10. Published 2026-09-26.
- How severe is CVE-2026-100670?
- High severity. CVSS v3 base score is 8.8 out of 10.