CVE-2025-57729 is a vulnerability identified in JetBrains IntelliJ IDEA versions prior to 2025.2, involving the automatic startup of the Language Server Protocol (LSP) server that can trigger unexpected plugin execution. The root cause is classified under CWE-829, which involves the inclusion of functionality from an untrusted control sphere, meaning that the IDE may load or execute plugins without proper validation or user consent. This automatic LSP server start can be exploited by an attacker with limited privileges and local access to cause unauthorized plugin activation, potentially leading to high confidentiality and integrity impacts by executing malicious code within the IDE environment. The CVSS v3.1 score is 6.5 (medium severity), reflecting the need for local access (AV:L), high attack complexity (AC:H), and low privileges (PR:L) but no user interaction (UI:N). The scope remains unchanged (S:U), indicating the impact is confined to the vulnerable component. The vulnerability could allow attackers to compromise source code confidentiality, modify project files, or inject malicious code during development. No public exploits or patches are currently available, but the vulnerability is published and assigned by JetBrains. The lack of user interaction and the automatic nature of the LSP server startup increase the risk in environments where multiple plugins are used or where untrusted plugins might be introduced. This vulnerability highlights the importance of strict plugin management and validation in IDEs.

The vulnerability poses a significant risk to organizations relying on IntelliJ IDEA for software development. Successful exploitation can lead to unauthorized code execution within the IDE, compromising the confidentiality and integrity of source code and project files. This can result in intellectual property theft, insertion of backdoors or malicious code into software projects, and potential downstream supply chain risks if compromised code is distributed. The availability impact is low but could manifest as IDE instability or crashes. Since exploitation requires local access and high attack complexity, remote attackers are less likely to exploit this directly, but insider threats or compromised developer machines could be vectors. The impact is particularly critical for organizations with strict code integrity requirements, such as financial institutions, software vendors, and critical infrastructure providers. The vulnerability could undermine trust in development environments and increase the risk of supply chain attacks if not addressed promptly.

Organizations should immediately review and restrict plugin usage within IntelliJ IDEA, ensuring only trusted plugins from verified sources are installed. Disable or limit automatic LSP server startup where possible until JetBrains releases an official patch in version 2025.2 or later. Implement strict access controls on developer workstations to prevent unauthorized local access and privilege escalation. Employ endpoint detection and response (EDR) solutions to monitor for unusual plugin activity or unexpected process launches related to the IDE. Conduct regular audits of installed plugins and IDE configurations to detect anomalies. Educate developers about the risks of installing untrusted plugins and the importance of maintaining updated IDE versions. Consider isolating development environments or using virtual machines to contain potential exploitation. Monitor JetBrains security advisories closely for patch releases and apply updates promptly once available.