JetBrains IntelliJ IDEA Arbitrary Local File Read via Web Server

CVE-2026-41882 is a high-severity vulnerability affecting multiple versions of JetBrains IntelliJ IDEA that allows attackers to read arbitrary local files through the IDE's built-in web server. This vulnerability matters because IntelliJ IDEA is one of the most widely used integrated development environments globally, with millions of developers relying on it daily. An attacker exploiting this flaw could access sensitive files such as source code, configuration files containing credentials, SSH keys, environment variables, or other confidential data stored on a developer's machine. Organizations with developers using affected versions face elevated risk of data exfiltration and potential supply chain compromise, particularly if sensitive intellectual property or authentication materials are accessible through the vulnerable web server.

While this CVE currently maps to zero Casky.ai skills (reflecting that specific detection patterns aren't yet catalogued), practitioners using Casky's Claude AI-powered platform with extended reasoning capabilities would focus detection efforts on CWE-59 (Improper Link Resolution Before File Access) attack patterns. Security teams should monitor for suspicious web server activity patterns typical of file enumeration and exfiltration attempts—such as unexpected HTTP requests to the built-in web server, unusual file path traversal patterns in logs, and access to sensitive file directories. Practitioners would examine network traffic and IDE logs for indicators of exploitation, correlating web server activity with file access patterns. The absence of mapped MITRE ATT&CK techniques underscores the importance of staying current with vulnerability intelligence, as Casky's skill library continuously evolves to capture emerging threat patterns and detection methodologies for newly disclosed vulnerabilities.