CVE-2026-28792 in tinacms
Summary
by MITRE • 03/12/2026
Tina is a headless content management system. Prior to 2.1.8 , the TinaCMS CLI dev server combines a permissive CORS configuration (Access-Control-Allow-Origin: *) with the path traversal vulnerability (previously reported) to enable a browser-based drive-by attack. A remote attacker can enumerate the filesystem, write arbitrary files, and delete arbitrary files on developer's machines by simply tricking them into visiting a malicious website while tinacms dev is running. This vulnerability is fixed in 2.1.8.
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Analysis
by VulDB Data Team • 03/15/2026
The vulnerability identified as CVE-2026-28792 affects TinaCMS, a headless content management system that operates in development environments. This security flaw exists in versions prior to 2.1.8 and represents a critical combination of configuration weaknesses that enables remote code execution capabilities through browser-based attacks. The vulnerability specifically targets the TinaCMS CLI development server which is commonly used by developers during the content creation and management process. When developers run the TinaCMS development server locally, they typically expose it on their machine's network interface to facilitate content editing and preview capabilities. The flaw lies in how the development server handles cross-origin resource sharing requests, creating a dangerous combination with existing path traversal vulnerabilities that previously existed within the system.
The technical exploitation of this vulnerability occurs through a sophisticated attack vector that leverages both a permissive CORS configuration and a path traversal flaw. The development server's Access-Control-Allow-Origin header is configured with a wildcard value, which allows any domain to make cross-origin requests to the server. This permissive configuration, combined with the path traversal vulnerability, creates an environment where remote attackers can manipulate file system operations through HTTP requests. The attack requires minimal user interaction, as victims only need to visit a malicious website while the TinaCMS development server is running locally on their machine. This browser-based drive-by attack scenario is particularly dangerous because it can be executed without any special privileges or complex exploitation techniques, relying instead on the developer's routine web browsing behavior and the running development environment.
The operational impact of this vulnerability extends beyond simple data compromise to encompass full system control capabilities for attackers. Remote threat actors can enumerate the file system structure, allowing them to discover sensitive files and directories on the developer's machine. They can write arbitrary files to any location within the system's file structure, potentially installing malware or backdoors. Additionally, the vulnerability enables attackers to delete arbitrary files, causing data loss or system disruption. The development environment typically contains source code, configuration files, and potentially sensitive credentials or personal information, making each compromised machine a potential entry point for broader attacks against the organization. This vulnerability particularly affects developers who run the TinaCMS development server on their local machines without proper network isolation or security controls.
Mitigation strategies for this vulnerability require immediate action to upgrade to TinaCMS version 2.1.8 or later, which addresses both the CORS misconfiguration and path traversal issues. Organizations should implement network segmentation to prevent external access to development servers and ensure that such servers are only accessible through secure internal networks. Security configurations should be reviewed to remove wildcard CORS settings and replace them with specific origin domains. Developers should be educated about the risks of running development servers with default configurations and the importance of proper network isolation. The vulnerability demonstrates the importance of secure development practices and the need for regular security updates, particularly in development environments where permissive configurations are common. This issue aligns with CWE-16 configuration vulnerabilities and represents a typical attack pattern described in the MITRE ATT&CK framework under initial access and execution techniques. Organizations should also consider implementing network monitoring to detect unusual traffic patterns that might indicate exploitation attempts against development servers.