Craft CMS up to 5.10.11 UsersController users/activate-user actionActivateUser privileges management

Summaryinfo

A vulnerability was found in Craft CMS up to 5.10.11. It has been rated as problematic. The affected element is the function UsersController::actionActivateUser of the file users/activate-user of the component UsersController. This manipulation causes privileges management. The identification of this vulnerability is CVE-2026-86731. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic was found in Craft CMS up to 5.10.11. Affected by this vulnerability is the function UsersController::actionActivateUser of the file users/activate-user of the component UsersController. The manipulation with an unknown input leads to a privileges management vulnerability. The CWE definition for the vulnerability is CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. As an impact it is known to affect integrity. The summary by CVE is:

Craft CMS versions 5.0.0-RC1 through 5.10.11 are missing an admin-target guard in UsersController::actionActivateUser (the users/activate-user action). While the action requires the administrateUsers permission, it does not call requireAdmin() when the targeted user is an administrator, unlike the mirror action actionDeactivateUser. As a result, an authenticated control panel user who is not an administrator but holds the administrateUsers permission can activate a pending or deliberately deactivated administrator account, which can lead to permission escalation when combined with resetting that account's password. The issue is fixed in Craft CMS 5.10.12.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-86731 since 09/08/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

Upgrading to version 5.10.12 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Content Management System

Name

• Craft CMS

Version

• 5.10.0
• 5.10.1
• 5.10.2
• 5.10.3
• 5.10.4
• 5.10.5
• 5.10.6
• 5.10.7
• 5.10.8
• 5.10.9
• 5.10.10
• 5.10.11

License

• free

CPE 2.3info

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CPE 2.2info

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• 🔒
• 🔒

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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