CVE-2025-57730
📋 TL;DR
This vulnerability allows HTML injection through JetBrains IntelliJ IDEA's Remote Development feature, enabling attackers to inject malicious HTML content that could lead to cross-site scripting (XSS) attacks. Users of IntelliJ IDEA versions before 2025.2 are affected when using Remote Development functionality.
💻 Affected Systems
- JetBrains IntelliJ IDEA
📦 What is this software?
Intellij Idea by Jetbrains
⚠️ Risk & Real-World Impact
Worst Case
An attacker could execute arbitrary JavaScript in the context of the victim's IntelliJ IDEA session, potentially leading to session hijacking, data theft, or further system compromise.
Likely Case
Attackers could inject malicious HTML that displays phishing content, redirects users to malicious sites, or steals sensitive information from the IDE interface.
If Mitigated
With proper input validation and output encoding, the injected HTML would be rendered as plain text without executing any scripts.
🎯 Exploit Status
Exploitation requires the attacker to be able to inject HTML content through the Remote Development interface, which typically requires some level of access or social engineering.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: IntelliJ IDEA 2025.2 or later
Vendor Advisory: https://www.jetbrains.com/privacy-security/issues-fixed/
Restart Required: No
Instructions:
1. Open IntelliJ IDEA. 2. Go to Help > Check for Updates. 3. Install version 2025.2 or later. 4. The update will apply automatically without requiring restart.
🔧 Temporary Workarounds
Disable Remote Development
allTemporarily disable the Remote Development feature to eliminate the attack vector
Navigate to Settings/Preferences > Build, Execution, Deployment > Remote Development and disable all remote development options
🧯 If You Can't Patch
- Disable Remote Development feature entirely
- Implement network segmentation to isolate IntelliJ IDEA instances from untrusted networks
🔍 How to Verify
Check if Vulnerable:
Check IntelliJ IDEA version in Help > About. If version is below 2025.2 and Remote Development is enabled, the system is vulnerable.Check Version:
Help > About in IntelliJ IDEA GUI (no CLI command available)Verify Fix Applied:
After updating, verify version is 2025.2 or higher in Help > About. Test Remote Development functionality to ensure it works without security issues.📡 Detection & Monitoring
Log Indicators:
- Unusual HTML content in Remote Development logs
- Suspicious network connections to/from IntelliJ IDEA Remote Development ports
Network Indicators:
- Unexpected HTML/JavaScript payloads in Remote Development traffic
- Connections to suspicious external resources from IntelliJ IDEA
SIEM Query:
source="intellij-idea" AND (event="remote_development" OR port=*remote_dev_port*) AND (content="<script>" OR content="javascript:")