# CVE-2026-75837: Grav missing admin.super guard in group blueprint access field

Source: https://junglewise.ai/threats/cve-2026-75837-grav-missing-admin-super-guard-in-group-blueprint-access-field  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-18. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-75837 · Severity: critical · CVSS 9.1 · Published 2026-08-18

Grav is a flat-file CMS used to manage websites without a database. An authenticated admin operator without super-admin privileges can escalate their account to full super-admin access by modifying a group's access permissions. This grants them unrestricted control of the admin panel, ability to execute code via the scheduler, and access to sensitive site configuration—equivalent to a complete account takeover.

Technologies: [Grav](https://junglewise.ai/threats/technologies/grav), [getgrav/grav (Packagist)](https://junglewise.ai/threats/technologies/getgrav-grav). Vendors: [Grav](https://junglewise.ai/threats/vendors/grav), [Packagist](https://junglewise.ai/threats/vendors/packagist).

## Quick answers

**Is CVE-2026-75837 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-75837 being exploited in the wild.

**How severe is CVE-2026-75837?** Critical severity, with a CVSS score of 9.1, published 18 August 2026.

**Which products and versions are affected?** Grav <= 2.0.12; getgrav/grav (Packagist) < 2.0.14, ECOSYSTEM:introduced=0,fixed=2.0.14.

**Is there a fix for CVE-2026-75837?** Yes. getgrav/grav (Packagist): upgrade to 2.0.14 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-75837 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-75837?** Check whether you run Grav or getgrav/grav (Packagist) 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.

## How to fix

- getgrav/grav (Packagist): upgrade to 2.0.14 or later

  ```sh
  composer require getgrav/grav:^2.0.14
  ```


## Technical details

A privilege escalation flaw exists in Grav's core group blueprint (`system/blueprints/user/group.yaml`). The `access` field, which defines permissions granted to all group members, lacks the `security@: admin.super` guard present in the functionally-identical account blueprint. This allows an authenticated operator holding only `admin.users.update` permission to POST a group-edit form with `access[admin][super]=1`. The Grav framework's `Blueprint::dynamicSecurity()` only applies field-level filtering for fields bearing the `security@` guard; since the group access field lacks this guard, it bypasses validation. The malicious value persists to `user://config/groups.yaml`, and on subsequent requests, `UserGroupObject::authorize()` grants super-admin privileges to all members of the group, including the attacker. The `check_authorize` field flag in the blueprint has zero PHP enforcement and provides no real protection. Patches should add the missing `security@: admin.super` guard or enforce a super-only strip on group ACL saves at the persistence layer.

## Affected products

- Grav Grav <= 2.0.12

## Identifiers

- CVE-2026-75837
- GHSA-xhfv-7758-r9hx

## Timeline

- 2026-09-17: disclosed
- 2026-09-17: advisory

## Related threats

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- [Grav information disclosure via nested Git repositories](https://junglewise.ai/threats/cve-2026-109326-grav-before-2-1-7-contains-an-information-disclosure)