CVE-2026-27081: 
WordPress vulnerability analysis and mitigation

CVE-2026-27081 is a Local File Inclusion (LFI) vulnerability in the Mikado-Themes Rosebud WordPress theme, versions 1.4 and earlier. It stems from improper control of filename parameters in PHP include/require statements, allowing unauthenticated remote attackers to include arbitrary local files. The vulnerability was reported by Tran Nguyen Bao Khanh (VCI - VNPT Cyber Immunity) on December 10, 2025, and published by Patchstack on March 10, 2026. It carries a CVSS v3.1 base score of 8.1 (High) (Patchstack, Feedly).

The vulnerability is classified under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program), commonly known as PHP Remote File Inclusion, though the actual attack vector here is Local File Inclusion. The Rosebud theme fails to properly validate or sanitize user-supplied input used in PHP include or require statements, enabling an attacker to manipulate the filename parameter to reference arbitrary files on the server. No authentication or user interaction is required, though the attack complexity is rated High, suggesting specific conditions or knowledge may be needed to exploit it successfully (Patchstack, Feedly).

Successful exploitation allows an unauthenticated attacker to read sensitive files on the server — including configuration files containing database credentials — potentially enabling complete database takeover. If PHP code execution is achievable via LFI (e.g., through log poisoning or inclusion of uploaded files), the attacker could execute arbitrary PHP code, leading to full compromise of confidentiality, integrity, and availability of the affected WordPress installation. The CVSS score reflects high impact across all three pillars (Patchstack, Feedly).

As of the time of reporting, there is no public proof-of-concept exploit and no evidence of active in-the-wild exploitation (Feedly). The EPSS score is approximately 0.0015 (0.15%), indicating a low but non-zero probability of exploitation in the near term. No threat actor attribution has been made, and the vulnerability does not appear in the CISA Known Exploited Vulnerabilities (KEV) catalog. Patchstack notes that vulnerabilities of this class are frequently used in mass-exploit campaigns targeting WordPress sites at scale (Patchstack).

1. Reconnaissance: Identify WordPress sites using the Rosebud theme (version ≤ 1.4) via passive scanning tools (e.g., WPScan, Shodan) or by inspecting theme metadata in publicly accessible style.css files.
2. Identify vulnerable parameter: Analyze the Rosebud theme's PHP source code or observed HTTP requests to locate parameters passed to include() or require() statements without proper sanitization.
3. Craft LFI payload: Construct a malicious HTTP request that manipulates the vulnerable parameter to traverse the directory structure (e.g., using ../../) and reference a sensitive file such as /etc/passwd or WordPress's wp-config.php.
4. Retrieve sensitive data: Submit the crafted request to the target server and observe the response for file contents, which may include database credentials, API keys, or other sensitive configuration data.
5. Escalate (optional): If conditions allow (e.g., writable upload directories, PHP session files), attempt to escalate LFI to Remote Code Execution via log poisoning or inclusion of a previously uploaded PHP web shell (Patchstack).

• Network: Unusual HTTP GET or POST requests to WordPress theme endpoints containing directory traversal sequences (e.g., ../, ..%2F, %2e%2e%2f) in query parameters or POST body fields.
• Logs: Web server access logs showing requests to Rosebud theme PHP files with suspicious parameter values referencing system files (e.g., /etc/passwd, wp-config.php); repeated 200 responses to such requests may indicate successful inclusion.
• File System: Unexpected PHP web shells or newly created files in the WordPress uploads directory (/wp-content/uploads/) that could be leveraged for code execution via LFI.
• Process: Unusual PHP child processes spawned by the web server process (e.g., curl, wget, reverse shell connections) following suspicious theme file requests.

No official patch from Mikado-Themes is currently available for the Rosebud theme (Patchstack). Recommended actions include:

• Disable the theme: If an alternative theme is available, disable Rosebud until a security update is released.
• Apply WAF rules: Patchstack has issued a virtual patch/mitigation rule to block LFI exploitation attempts for subscribers.
• Restrict file permissions: Limit read access to sensitive server files (e.g., wp-config.php) at the OS level to reduce the impact of successful exploitation.
• Monitor for updates: Watch the Mikado-Themes repository and Patchstack database for an official patched version.
• Review server logs: Actively monitor web server logs for directory traversal patterns in requests targeting the Rosebud theme.

Wordfence referenced this vulnerability in their weekly WordPress vulnerability report for the week of March 9–15, 2026, indicating it received attention from the broader WordPress security community (Wordfence Blog). Patchstack, which coordinated disclosure, classified it as high priority and noted that LFI vulnerabilities of this type are commonly leveraged in mass-exploit campaigns against WordPress sites (Patchstack). No significant social media discussion or vendor statement from Mikado-Themes has been observed.