Craft CMS Authorization Bypass

Craft is a content management system (CMS). [CVSS 7.5 HIGH]

Craft CMS prior to versions 4.17.0-beta.1 and 5.9.0-beta.1 allows users with entry creation permissions to arbitrarily assign authorship of new entries to any user, including administrators, through mass assignment of the authorId parameter. Public exploit code exists for this vulnerability, enabling attackers to spoof entry authorship and manipulate content attribution. The vulnerability is fixed in the specified beta releases.

Unauthenticated attackers can trigger activation emails for pending user accounts in Craft CMS versions prior to 5.9.0-beta.2 and 4.17.0-beta.2 by exploiting an unprotected endpoint that lacks permission checks. If an attacker controls the target user's email address, they can complete account activation and gain unauthorized system access. A patch is available in the latest beta versions.

Craft CMS prior to versions 5.9.0-beta.1 and 4.17.0-beta.1 fails to properly authorize the "Duplicate" entry action, allowing authenticated users to bypass UI restrictions and duplicate entries via direct requests. An attacker with minimal "View Entries" permissions can exploit predictable, incremental Entry IDs to brute-force and duplicate other users' restricted content, gaining unauthorized access to sensitive data. Public exploit code exists for this vulnerability.