CVE-2026-75052 in IntelliJ IDEA
Summary
by MITRE • 08/17/2026
In JetBrains IntelliJ IDEA before 2026.2.1 command execution via crafted Markdown preview content was possible in trusted projects
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Analysis
by VulDB Data Team • 08/17/2026
A critical security vulnerability exists within the Markdown rendering engine of JetBrains IntelliJ IDEA prior to version 2026.2.1, specifically affecting projects designated as trusted. This flaw allows an attacker who can inject or modify markdown content within a project file to execute arbitrary commands on the host system where the IDE is running. The vulnerability stems from insufficient sanitization and validation of input data processed by the preview component, which fails to properly isolate untrusted markup before rendering it in a context that permits script execution. This represents a classic case of improper neutralization of special elements used in an output or redirect context, commonly categorized under CWE-79 if interpreted as cross-site scripting leading to code injection, or more accurately CWE-94 for command injection via generated scripts depending on the specific implementation details of the preview engine's sandboxing mechanisms.
The operational impact of this vulnerability is severe because it bypasses standard security boundaries typically enforced by integrated development environments. When a user opens a trusted project containing maliciously crafted markdown content, the IDE processes the file and renders its preview pane. During this rendering process, the application interprets certain syntax elements as executable code rather than static text. An attacker could embed specific patterns within headers, links, or custom HTML blocks allowed by the markdown parser that trigger system-level commands upon display. This means that simply viewing a document in the IDE can result in remote code execution without any additional user interaction such as clicking buttons or confirming dialogs, effectively turning a passive reading action into an active exploitation vector.
This type of vulnerability aligns with several tactics defined in the MITRE ATT&CK framework, particularly those related to Execution and Persistence. The initial access phase is facilitated through social engineering or supply chain compromise where malicious markdown files are introduced into trusted repositories. Once executed, the attacker gains a foothold on the developer's machine, potentially leading to data exfiltration, installation of malware, or lateral movement within corporate networks if the development environment has network access credentials. The trust model employed by IntelliJ IDEA assumes that content in trusted projects is safe from arbitrary code execution, but this assumption is broken when the markdown parser does not strictly enforce a whitelist of allowed tags and attributes while stripping out event handlers or script blocks that could invoke system shells.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements. The primary defense is to upgrade JetBrains IntelliJ IDEA to version 2026.2.1 or later, where the vendor has addressed this issue by enhancing input validation and strengthening the sandboxing of the preview component. Until an update can be applied, developers should exercise extreme caution when opening markdown files from untrusted sources, even within projects marked as trusted. It is advisable to disable the live preview feature for external documents or use a separate, isolated text editor that does not execute scripts during rendering. Additionally, organizations should implement strict code review policies and automated static analysis tools configured to detect suspicious patterns in documentation files, ensuring that markdown content undergoes sanitization before being committed to version control systems. Regular security training for development teams regarding the risks of rich media processing in IDEs is also essential to reduce the attack surface associated with such vulnerabilities.