CVE-2026-86731

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    CVE-2026-86731

    Published: 8 Sept 2026Last Modified: 10 Sept 2026

    Summary: Craft CMS 5.0.0-RC1 before 5.10.12 Permission Escalation via UsersController

    Details: 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.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86731.json, https://github.com/craftcms/cms/security/advisories/GHSA-jqf5-vfg6-8cx5, https://nvd.nist.gov/vuln/detail/CVE-2026-86731, https://www.vulncheck.com/advisories/craft-cms-5.0.0-rc1-before-5.10.12-permission-escalation-via-userscontroller

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 04755d93f86d07cc183db47db8a0eee106892e30
    Fixed -4edc686e69515ad42f5608580e351c765b664f80

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-86731 | CVE-DB