Executive Summary

The WordPress Malmö Theme, versions 2.2 and below, contains a Local File Inclusion (LFI) vulnerability identified as CVE-2026-39558. This flaw allows unauthenticated attackers to include local files on the target website.

Exploiting this vulnerability can expose sensitive data such as database credentials and may lead to a full database takeover.

The vulnerability is categorized under OWASP Top 10 category A3: Injection and requires no privileges to exploit.

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Impact Analysis

This vulnerability can have severe impacts including exposure of sensitive data like database credentials.

An attacker can potentially take over the entire database of the affected website.

Because it requires no authentication and has a high severity score (CVSS 8.1), it poses a significant risk of exploitation in widespread attacks targeting many websites.

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Detection Guidance

The vulnerability is a Local File Inclusion (LFI) flaw in the WordPress Malmö Theme versions 2.2 and below, which allows unauthenticated attackers to include local files on the target website.

Detection typically involves monitoring for suspicious HTTP requests attempting to include local files, such as requests containing file path traversal patterns or parameters referencing local files.

While specific commands are not provided, network administrators can use tools like curl or wget to simulate requests with file inclusion payloads to test if the site is vulnerable.

• Example curl command to test for LFI: curl -v "http://target-site.com/?file=../../../../etc/passwd"
• Use web server logs or intrusion detection systems (IDS) to search for suspicious patterns such as '../' sequences or attempts to access sensitive files.

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Mitigation Strategies

The immediate recommended step is to update the WordPress Malmö Theme to version 2.3 or later, which contains the patch for this vulnerability.

Until the update can be applied, it is advised to implement the mitigation rule provided by Patchstack to block attacks exploiting this vulnerability.

Additionally, monitoring and blocking suspicious requests that attempt local file inclusion can help reduce risk.

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Compliance Impact

The vulnerability allows unauthenticated attackers to include local files on the target website, potentially exposing sensitive data such as database credentials and enabling a full database takeover.

Exposure of sensitive data due to this vulnerability could lead to non-compliance with data protection regulations like GDPR and HIPAA, which require safeguarding personal and sensitive information against unauthorized access.

Therefore, failure to patch this vulnerability or mitigate it could result in violations of these standards, increasing legal and financial risks for affected organizations.

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