# CVE-2026-100670: Grav CMS blueprint guard bypass privilege escalation

Source: https://junglewise.ai/threats/cve-2026-100670-grav-cms-2-0-14-through-2-0-24-contains-a-privilege-escalation  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-26. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-100670 · Severity: high · CVSS 8.8 · Published 2026-09-26

Grav CMS is a flat-file content management system used to build websites and applications. A security flaw in versions 2.0.14 through 2.0.24 allows an authenticated administrator with limited user management permissions to escalate to full super-admin access by bypassing access controls. An attacker could then install malicious plugins, modify configuration, access all user accounts, and take complete control of the CMS.

Technologies: [Grav CMS](https://junglewise.ai/threats/technologies/grav-cms-1). Vendors: [Grav](https://junglewise.ai/threats/vendors/grav).

## Quick answers

**Is CVE-2026-100670 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-100670 being exploited in the wild.

**How severe is CVE-2026-100670?** High severity, with a CVSS score of 8.8, published 26 September 2026.

**Which products and versions are affected?** Grav CMS 2.0.14 through 2.0.24.

**Is there a fix for CVE-2026-100670?** A patch was published on 2026-09-26: Fixed in version 2.0.25 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-100670 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-100670?** Check whether you run Grav CMS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability exploits a path-based authorization bypass in blueprint field guards. The `security@: admin.super` guard validates nested array keys like `access[admin][super]` but fails to recognize flat dot-notation keys like `access.admin.super`. An authenticated operator with admin.users but not admin.super can submit the flat key, which bypasses BlueprintSchema::filterArray(), survives flattening, and is reconstructed by FlexObject::update() via setNestedProperty(), effectively granting super-admin privileges to their account or affiliated group.

## Affected products

- Grav CMS 2.0.14 through 2.0.24

## Timeline

- 2026-09-26: disclosed
- 2026-09-26: patched: Fixed in version 2.0.25

## References

- [https://github.com/getgrav/grav/security/advisories/GHSA-mwjj-r7vm-pgqm](https://github.com/getgrav/grav/security/advisories/GHSA-mwjj-r7vm-pgqm)
- [https://www.vulncheck.com/advisories/grav-cms-2.0.14-through-2.0.24-privilege-escalation-via-blueprint-guard-bypass](https://www.vulncheck.com/advisories/grav-cms-2.0.14-through-2.0.24-privilege-escalation-via-blueprint-guard-bypass)