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CVE-2026-100670: Grav CMS allows admin users to gain super‑admin rights

CVE-2026-100670 · published 2 days ago

Summary

Versions 2.0.14 through 2.0.24 of Grav CMS let a logged‑in admin who does not have full super‑admin permission upgrade their own account to that level. This gives them control over site settings, plugins, themes, files, and all user accounts. Upgrade to version 2.0.25 or newer to close the gap.

What to do

Update getgrav grav to version 2.0.25 or later.

Affected software

Vendor	Product	Affected versions
getgrav	grav	< 2.0.25

Original advisory text

Grav CMS 2.0.14 through 2.0.24 Privilege Escalation via Blueprint Guard Bypass

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.

References

https://github.com/getgrav/grav/security/advisories/GHSA-mwjj-r7vm-pgqm Vendor Advisory
https://www.vulncheck.com/advisories/grav-cms-2.0.14-through-2.0.24-privilege-es... Vendor Advisory
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-1006... Vendor Advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-100670 Vendor Advisory

Severity

9.4 Critical

CVSS 3.1: 8.8 (MITRE)

Exploitation

EPSS <1%

Type

CWE-639Authorization Bypass Through User-Controlled Key

Timeline

Published26 Sep 2026

Updated28 Sep 2026

First seen26 Sep 2026

Sources

CVE-2026-100670 · NVD

CVE-2026-100670 · MITRE

CVE-2026-100670 · OSV

GHSA-mwjj-r7vm-pgqm · GHSA

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