CVE-2026-66710 in E2Pdf Plugin
Summary
by MITRE • 08/06/2026
Unauthenticated Local File Inclusion in e2pdf <= 1.32.40 versions.
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Analysis
by VulDB Data Team • 08/06/2026
The vulnerability identified as unauthenticated local file inclusion in e2pdf versions up to 132.40 represents a critical security flaw that allows attackers to access arbitrary files on the server without requiring authentication credentials. This type of vulnerability falls under the Common Weakness Enumeration category CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal attacks. The issue stems from insufficient input validation and sanitization within the application's file handling mechanisms, particularly in how it processes user-supplied parameters that are subsequently used to construct file paths.
The technical implementation of this vulnerability occurs when the e2pdf plugin fails to properly validate or sanitize file path parameters received through HTTP requests. Attackers can exploit this weakness by crafting malicious requests that include directory traversal sequences such as ../ or ..\ in their input parameters, allowing them to navigate outside the intended directory structure and access sensitive files on the server. This includes configuration files, database credentials, application source code, and potentially system files that should remain protected from unauthorized access.
The operational impact of this vulnerability extends beyond simple information disclosure, as it can lead to complete system compromise when combined with other attack vectors. An attacker who successfully exploits this flaw can gain access to critical system resources including database connection strings, API keys, administrative credentials, and application configuration files that contain sensitive information. The lack of authentication requirements makes this vulnerability particularly dangerous as it can be exploited by anyone with access to the target system without needing valid user credentials or privileges.
Security professionals should implement multiple layers of mitigation strategies to address this vulnerability effectively. Immediate remediation involves upgrading to e2pdf versions beyond 132.40 where the issue has been patched and properly addressed. Additionally, implementing proper input validation and sanitization measures within the application code can prevent malicious path traversal attempts from being processed. Network-level protections including web application firewalls and strict access controls should be deployed to monitor and block suspicious file access patterns. The vulnerability also aligns with ATT&CK technique T1566 which covers credential harvesting through various means, though in this case the focus is on unauthorized file access rather than credential theft.
Organizations utilizing e2pdf plugins must conduct thorough security assessments to identify other potential vulnerabilities that may exist within their systems and implement comprehensive monitoring solutions that can detect anomalous file access patterns. The vulnerability demonstrates the importance of proper input validation and the principle of least privilege in application design, where applications should never be granted access to files beyond what is absolutely necessary for their operation. Regular security audits and penetration testing should include evaluation of file handling mechanisms to prevent similar issues from being introduced during development cycles.