Vulnerability Database

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Total vulnerabilities in the database

Craft CMS: Authorized asset "preview file" requests bypass allows users without asset access to retrieve private preview metadata — craftcms / cms

Exposure of Sensitive Information to an Unauthorized Actor

Summary

An authenticated low-privileged user can call assets/preview-file for an asset they are not authorized to view and still receive preview response data (previewHtml) for that private asset.

The returned preview HTML included a private preview image route containing the target private assetId, even though canView was false for the attacker account.

Details

  1. assets/preview-file accepts a maliciously controlled assetId and renders preview output.
  2. The action does not enforce per-asset view authorization prior to returning preview content.
  3. As a result, an authenticated user without asset-view permission can still obtain private preview output.

This affects Craft installations with authenticated users of mixed privilege levels with private assets.

Resources

  • d30df3112220db1ffd6726a3ed11857014c7fb27
  • b1cddf72c98a

No technical information available.

Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

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