CVE-2026-49227 in Vvveb
Summary
by MITRE • 08/18/2026
Vvveb is a powerful and easy to use CMS with page builder to build websites, blogs or ecommerce stores. Prior to 1.0.8.4, Vvveb backend comment operations allow a low-privileged Author to manage comments under another Author's posts. The admin/controller/content/comment.php and admin/controller/content/comments.php controllers and the admin/sql/sqlite/comment.sql queries accept a caller-controlled comment_id without verifying comment.post_id against post.admin_id for the current admin_id. An attacker can read pending comment content and commenter email addresses, change moderation status, edit comment content, or delete comments, breaking author and moderation boundaries. This issue is fixed in version 1.0.8.4.
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Analysis
by VulDB Data Team • 08/18/2026
Vvveb CMS versions prior to 1.0.8.4 contain a critical authorization flaw within its backend comment management system that allows low-privileged users to perform actions on resources belonging to other authors. This vulnerability stems from an insecure direct object reference mechanism where the application fails to enforce proper ownership checks when processing requests related to comments. Specifically, the controllers located at admin/controller/content/comment.php and admin/controller/content/comments.php, along with the associated SQLite queries in admin/sql/sqlite/comment.sql, accept a caller-controlled comment_id parameter without validating whether that comment belongs to a post owned by the currently authenticated user. The application logic does not cross-reference the comment's parent post identifier against the administrator or author identifier of the requesting session, thereby bypassing intended access controls.
The technical root cause is a failure in server-side object authorization checks. When an attacker with Author-level privileges submits a request to manage comments, they can manipulate the comment_id parameter to target any comment within the system rather than being restricted to those associated with their own published content. Because the backend does not verify that post.admin_id matches the current user's identity before executing operations such as reading, editing, deleting, or changing moderation status, it effectively treats all comments as publicly accessible for management purposes by anyone logged in with at least Author privileges. This represents a classic case of broken access control where the application trusts client-supplied identifiers without ensuring they align with the permissions and ownership context of the authenticated user session.
The operational impact of this vulnerability is significant due to the range of actions an attacker can perform on arbitrary comments. An adversary can read pending comment content, which may contain sensitive information such as commenter email addresses or personal data submitted by website visitors. Furthermore, they possess the ability to alter moderation status, potentially promoting malicious comments while suppressing legitimate ones, thereby compromising site integrity and reputation. The capability to edit existing comment text allows for defacement or injection of harmful payloads within user-generated content fields. Additionally, the power to delete any comment enables denial-of-service against specific discussions or removal of evidence related to other security incidents. These actions collectively break the fundamental boundaries between authors and moderators, undermining trust in the CMS's multi-user environment.
This vulnerability aligns with CWE-639, which describes authorization bypass through a direct object reference, as well as CWE-284 regarding improper access control. In terms of offensive cybersecurity frameworks, this flaw facilitates actions consistent with MITRE ATT&CK technique T1078, specifically valid accounts and potentially T1530 for data exfiltration if sensitive comment data is harvested. To mitigate this risk, organizations running Vvveb CMS must upgrade to version 1.0.8.4 or later where the issue has been resolved by implementing strict ownership verification logic in the backend controllers. Developers should ensure that all resource manipulation endpoints validate that the requesting user owns the target object before allowing state-changing operations. Implementing robust input validation and enforcing principle of least privilege at the application layer are essential steps to prevent similar authorization bypasses in future updates or custom modules.