CVE-2026-82394 in Sulu
Summary
by MITRE • 08/31/2026
Sulu is an open-source PHP content management system based on the Symfony framework. Prior to versions 2.6.25 and 3.0.8, the preview-link endpoint and src/Sulu/Bundle/PreviewBundle/Application/Manager/PreviewLinkManager.php do not enforce VIEW permission for the target resource in PreviewLinkManager::generate() or PreviewLinkManager::revoke(). An authenticated administration user who knows a target resource identifier can create or revoke a preview link for any page, article, or snippet, including content in a webspace or area the user cannot view. A generated preview URL is public and resolves content by an opaque token, allowing the user or anyone receiving the link to read restricted content without authentication. This issue is fixed in versions 2.6.25 and 3.0.8.
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Analysis
by VulDB Data Team • 08/31/2026
Sulu is a widely adopted open-source PHP content management system built upon the Symfony framework, designed for managing complex digital experiences across multiple channels. A critical security flaw was identified within its preview functionality prior to versions 2.6.25 and 3.0.8, specifically affecting the PreviewLinkManager component located at src/Sulu/Bundle/PreviewBundle/Application/Manager/PreviewLinkManager.php. This vulnerability stems from a failure in access control logic where the system does not properly enforce VIEW permissions for the target resource when generating or revoking preview links. The core technical flaw lies in the generate and revoke methods of the PreviewLinkManager class, which allow an authenticated administration user to create or invalidate preview tokens for any content entity regardless of their actual authorization level on that specific item.
The operational impact of this vulnerability is significant because it enables unauthorized data exposure through a mechanism intended for temporary access by authorized editors. An attacker who possesses valid administrative credentials and knows the identifier of a target resource can generate a public preview URL. This URL relies on an opaque token to resolve content, meaning no additional authentication or session validation is required when accessing the link once generated. Consequently, any individual in possession of this link can view restricted content that they would otherwise be denied access to due to permission restrictions. This effectively bypasses the granular security controls implemented within Sulu for specific webspaces, areas, pages, articles, and snippets, allowing sensitive internal documents or unpublished drafts to become publicly accessible via a simple hyperlink.
This vulnerability is classified under CWE-269 Improper Privilege Management as it involves an authenticated user exploiting insufficient checks on their privileges to access resources outside their scope. From the perspective of adversary tactics, this behavior aligns with ATT&CK technique T1078 Valid Accounts, where legitimate credentials are used to gain unauthorized access, and potentially T1539 Steal Web Session Cookie if session data is also compromised through other vectors associated with preview links. The flaw highlights a common challenge in content management systems where administrative functions must be carefully decoupled from resource-specific permissions to prevent privilege escalation or lateral movement within the application's security model.
To mitigate this risk, organizations running Sulu versions prior to 2.6.25 and 3.0.8 should immediately upgrade to these patched releases which correct the permission checks in the PreviewLinkManager class. Until an upgrade is feasible, administrators should restrict access to administrative interfaces using network-level controls such as firewalls or VPNs to limit exposure to trusted IP addresses only. Additionally, implementing strict monitoring for unusual generation of preview links by users who do not typically require them can help detect potential exploitation attempts in real-time. Regular audits of user permissions and adherence to the principle of least privilege are essential practices to minimize the attack surface associated with administrative features in content management platforms.