Executive Summary

[{'type': 'paragraph', 'content': "CVE-2026-1557 is a Path Traversal vulnerability in the WP Responsive Images plugin for WordPress, affecting all versions up to and including 1.0. The vulnerability arises from improper validation of the 'src' parameter used to specify image file paths."}, {'type': 'paragraph', 'content': "Specifically, the plugin's image handler script takes the 'src' parameter from an HTTP GET request and concatenates it directly with the server's document root to form a file path without sufficient sanitization. This allows unauthenticated attackers to manipulate the 'src' parameter to traverse directories and read arbitrary files on the server."}, {'type': 'paragraph', 'content': 'As a result, attackers can access sensitive files outside the intended image directories, potentially exposing confidential information.'}] [4, 1]

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Impact Analysis

This vulnerability allows unauthenticated attackers to read arbitrary files on the server hosting the WordPress site using the vulnerable plugin.

• Exposure of sensitive information stored in files outside the web root or image directories.
• Potential leakage of configuration files, credentials, or other confidential data.
• Increased risk of further attacks due to information disclosure.

The vulnerability has a CVSS v3.1 base score of 7.5, indicating a high severity with network attack vector, low attack complexity, no privileges required, and no user interaction needed.

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': "This vulnerability can be detected by monitoring HTTP requests to the WordPress site that include the 'src' parameter in the URL, especially those attempting directory traversal patterns such as '../' sequences."}, {'type': 'paragraph', 'content': 'A practical approach is to look for suspicious GET requests targeting the image handler script or URLs rewritten by the plugin that contain path traversal attempts.'}, {'type': 'list_item', 'content': "Use web server access logs to search for requests with 'src' parameters containing '../' or other traversal patterns."}, {'type': 'list_item', 'content': 'Example command to detect such attempts in Apache logs: grep -E "src=.*\\.\\./" /var/log/apache2/access.log'}, {'type': 'list_item', 'content': "Alternatively, use network monitoring tools or intrusion detection systems to alert on HTTP requests with suspicious 'src' parameter values."}] [4]

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Mitigation Strategies

[{'type': 'paragraph', 'content': 'Immediate mitigation steps include disabling or uninstalling the vulnerable WP Responsive Images plugin until a patched version is available.'}, {'type': 'paragraph', 'content': "Additionally, restrict access to the image handler script or the plugin's directories via web server configuration to prevent unauthorized access."}, {'type': 'list_item', 'content': "Apply input validation and sanitization on the 'src' parameter to prevent directory traversal, if you have the capability to patch the plugin code."}, {'type': 'list_item', 'content': 'Monitor and block suspicious requests attempting to exploit the vulnerability using web application firewalls or security plugins.'}, {'type': 'list_item', 'content': 'Keep the WordPress installation and all plugins updated to the latest versions once a fix is released.'}] [4]

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