CVE-2026-28151 Overview
CVE-2026-28151 is an unauthenticated Local File Inclusion (LFI) vulnerability affecting the Tonda WordPress theme in versions prior to 2.6. The flaw allows remote attackers to include and execute arbitrary local files on the server without authentication. The weakness is classified under CWE-98, Improper Control of Filename for Include/Require Statement in PHP Program. Successful exploitation can lead to sensitive information disclosure, code execution, and full site compromise. The vulnerability was published to the National Vulnerability Database (NVD) via Patchstack.
Critical Impact
Unauthenticated attackers can include arbitrary local files, potentially leading to remote code execution and complete compromise of WordPress sites running the Tonda theme.
Affected Products
- WordPress Tonda theme versions prior to 2.6
- WordPress installations using the vulnerable Tonda theme
- Sites where the theme is active or reachable via public endpoints
Discovery Timeline
- 2026-08-24 - CVE-2026-28151 published to NVD
- 2026-08-24 - Last updated in NVD database
Technical Details for CVE-2026-28151
Vulnerability Analysis
The Tonda theme contains an unauthenticated Local File Inclusion flaw. A PHP include, require, or equivalent statement consumes attacker-controlled input without validating or sanitizing the target path. This lets remote users direct the theme to load arbitrary files present on the underlying server.
Because the vulnerable code path is reachable without authentication, an attacker only needs network access to the site. Once included, PHP source files, configuration files containing database credentials, or attacker-controlled payloads staged elsewhere can be executed within the WordPress process context.
Root Cause
The root cause is improper control of a filename passed to a PHP file inclusion function, categorized as CWE-98. The theme trusts user-supplied input, such as a request parameter, when constructing a file path for include or require. No allowlist, canonicalization, or path traversal filtering is applied before the file is loaded.
Attack Vector
Exploitation occurs over the network against a WordPress site running Tonda earlier than 2.6. An attacker crafts an HTTP request that supplies a manipulated file path parameter to a vulnerable theme endpoint. Depending on server configuration, the attacker can read sensitive files such as wp-config.php or chain the LFI with log poisoning or session file inclusion to achieve code execution. Refer to the Patchstack advisory for additional technical context.
Detection Methods for CVE-2026-28151
Indicators of Compromise
- HTTP requests to Tonda theme endpoints containing path traversal sequences such as ../ or encoded variants %2e%2e%2f.
- Access log entries referencing sensitive server paths like /etc/passwd, wp-config.php, or PHP session files.
- Unexpected outbound connections or new PHP files created within the theme, uploads, or cache directories.
- Web server errors indicating failed include or require calls originating from Tonda theme files.
Detection Strategies
- Inspect web server access logs for query parameters that reference file paths or traversal patterns targeting the Tonda theme directory.
- Deploy web application firewall (WAF) rules that block path traversal and PHP wrapper schemes such as php://filter and file://.
- Monitor file integrity on the WordPress installation, focusing on wp-content/themes/tonda/ and the uploads directory.
Monitoring Recommendations
- Enable verbose PHP logging to capture inclusion attempts referencing unexpected paths and correlate them with source IP addresses.
- Alert on repeated HTTP 200 responses to Tonda theme endpoints carrying suspicious file-path parameters.
- Forward WordPress, PHP-FPM, and web server logs to a centralized analytics platform for cross-source correlation and retention.
How to Mitigate CVE-2026-28151
Immediate Actions Required
- Upgrade the Tonda WordPress theme to version 2.6 or later on all affected sites.
- Audit web server and WordPress logs for prior exploitation attempts referencing theme endpoints with path parameters.
- Rotate WordPress secrets, database credentials, and API keys if wp-config.php may have been disclosed.
- Review the theme and uploads directories for webshells or files modified outside normal maintenance windows.
Patch Information
The vendor addressed the vulnerability in Tonda theme version 2.6. Update through the WordPress admin console or by replacing the theme files directly. Full details are available in the Patchstack advisory for the Tonda theme.
Workarounds
- Restrict access to the site with a WAF ruleset that blocks path traversal payloads and PHP stream wrappers.
- Set the PHP open_basedir directive to constrain file access to the WordPress installation path.
- Disable the Tonda theme and switch to a maintained alternative until patching is complete.
- Enforce least-privilege file system permissions so the PHP process cannot read sensitive OS files.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
