GetGrav up to 1.4.6 Flex Objects API update improper authorization

Summaryinfo

A vulnerability was found in GetGrav Grav up to 1.4.6 and classified as problematic. Affected by this vulnerability is the function FlexApiController::update of the component Flex Objects API. Executing a manipulation can lead to improper authorization. This vulnerability is handled as CVE-2026-72831. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as problematic was found in GetGrav Grav up to 1.4.6. This vulnerability affects the function FlexApiController::update of the component Flex Objects API. The manipulation with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

The Flex Objects plugin (through 1.4.6, tested with Grav 2.0.11) contains an incorrect authorization vulnerability in its Flex Objects API. FlexApiController::update() checks only the general Flex directory permission and does not apply the additional target/field/super-admin checks enforced by the dedicated Users and Groups API controllers. An authenticated account with api.access, admin.login, and users.update permissions (but without api.users.write or admin.super) can use the generic /api/v1/flex-objects/user-accounts endpoint to change a super administrator's password, or the /api/v1/flex-objects/user-groups endpoint to grant its group admin.super, resulting in full site takeover. Fixed in Flex Objects 1.4.7.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-72831 since 08/10/2026. The exploitation appears to be easy. The attack can be initiated remotely. The exploitation needs additional levels of successful authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1548.002.

Upgrading to version 1.4.7 eliminates this vulnerability.

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Productinfo

Vendor

• GetGrav

Name

• Grav

Version

• 1.4.0
• 1.4.1
• 1.4.2
• 1.4.3
• 1.4.4
• 1.4.5
• 1.4.6

Website

• Product: https://github.com/getgrav/grav/

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