CVE-2025-6989 in Kallyas Plugin
Summary
by MITRE • 07/26/2025
The Kallyas theme for WordPress is vulnerable to arbitrary folder deletion due to insufficient file path validation in the delete_font() function in all versions up to, and including, 4.21.0. This makes it possible for authenticated attackers, with Contributor-level access and above, to delete arbitrary folders on the server.
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Analysis
by VulDB Data Team • 07/26/2025
The vulnerability identified as CVE-2025-6989 affects the Kallyas theme for WordPress, representing a critical security flaw that undermines the integrity of web applications built on this platform. This issue stems from inadequate input validation within the delete_font() function, which is designed to handle font deletion operations within the theme's administrative interface. The flaw exists across all versions of the theme up to and including version 4.21.0, making it a widespread concern for WordPress installations utilizing this particular theme. The vulnerability's classification as a path traversal or directory traversal issue indicates that attackers can manipulate file system operations through improper validation of user-supplied input.
The technical exploitation of this vulnerability requires an authenticated attacker possessing at least Contributor-level privileges within the WordPress environment, which is a relatively low barrier to entry in many WordPress installations. This access level allows the malicious actor to leverage the flawed delete_font() function to execute arbitrary folder deletion commands on the underlying server. The insufficient file path validation means that the function does not properly sanitize or verify the paths provided by users, enabling attackers to construct malicious paths that can traverse directories and target folders beyond the intended scope of font management operations. This weakness directly maps to CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal attacks.
The operational impact of this vulnerability extends beyond simple data loss, as it enables attackers to potentially compromise the entire WordPress installation and underlying server infrastructure. An attacker could exploit this flaw to delete critical system directories, theme files, plugin components, or even core WordPress files, leading to complete site compromise and potential data destruction. The vulnerability's nature allows for broad-reaching consequences since folder deletion operations can affect not only theme-specific resources but also system files that are essential for proper application functioning. This capability makes the vulnerability particularly dangerous in environments where WordPress is used for critical business operations or serves as a platform for sensitive content management.
Mitigation strategies for CVE-2025-6989 should prioritize immediate theme updates to versions that address the path validation issue, with administrators monitoring for security patches released by the theme developers. The implementation of proper input validation and sanitization measures within the delete_font() function is essential, requiring that all user-supplied paths be strictly validated against a predefined whitelist of acceptable directories. Network segmentation and privilege management should be enforced to limit the impact of potential exploitation, ensuring that even if an attacker gains access to a Contributor account, the damage they can inflict remains constrained. Additionally, regular security audits and monitoring of file system changes should be implemented to detect unauthorized deletions and provide early warning of potential exploitation attempts. Organizations should also consider implementing web application firewalls and intrusion detection systems that can identify and block malicious requests targeting this specific vulnerability pattern, aligning with ATT&CK technique T1059.007 for command and scripting interpreter usage in exploitation scenarios.