CVE-2025-26779 identifies a path traversal vulnerability in the Keep Backup Daily plugin by Fahad Mahmood, affecting all versions up to 2.1.0. Path traversal vulnerabilities occur when an application improperly restricts file path inputs, allowing attackers to navigate outside the intended directory structure. In this case, the plugin fails to adequately sanitize or validate user-supplied file path parameters, enabling an attacker to access arbitrary files on the server by manipulating the pathname. This can lead to unauthorized disclosure of sensitive files, including configuration files, credentials, or backup data. The vulnerability does not require authentication, making it exploitable by remote unauthenticated attackers. No CVSS score has been assigned yet, and no patches or official fixes have been published. The plugin is commonly used in WordPress environments for backup purposes, which means the vulnerability could expose critical backup data or server files. While no known exploits are currently reported in the wild, the nature of path traversal vulnerabilities makes them attractive targets for attackers seeking to escalate access or gather intelligence. The lack of patch availability necessitates immediate mitigation efforts by users and administrators to prevent exploitation. Monitoring and restricting access to the plugin’s endpoints and input validation are critical interim steps.

The primary impact of this vulnerability is unauthorized access to sensitive files outside the intended backup directory, which compromises confidentiality. Attackers could retrieve configuration files, database credentials, or other sensitive data stored on the server, potentially leading to further exploitation such as privilege escalation or lateral movement. The integrity of backup data could also be at risk if attackers modify or delete files, although this depends on the attacker's capabilities post-exploitation. Availability impact is generally low unless attackers delete or corrupt critical files. Because the vulnerability does not require authentication, the attack surface is broad, increasing the risk to organizations using the affected plugin. Enterprises relying on Keep Backup Daily for critical backup operations may face data breaches, regulatory compliance issues, and operational disruptions. The absence of a patch increases exposure duration, heightening risk. Overall, the vulnerability poses a significant threat to organizations’ data security and operational continuity.

Until an official patch is released, organizations should implement the following mitigations: 1) Restrict access to the Keep Backup Daily plugin endpoints via web application firewalls (WAF) or IP whitelisting to limit exposure to trusted users only. 2) Employ strict input validation and sanitization at the web server or reverse proxy level to block suspicious path traversal patterns such as '../' sequences. 3) Regularly audit and monitor server logs for unusual access patterns or attempts to exploit path traversal. 4) Limit file system permissions for the web server user to the minimum necessary, preventing access to sensitive directories outside the backup scope. 5) Consider disabling or uninstalling the Keep Backup Daily plugin temporarily if backups can be managed through alternative secure methods. 6) Maintain regular offline backups to ensure recovery capability in case of compromise. 7) Stay informed on vendor updates and apply patches immediately once available. 8) Conduct penetration testing focused on path traversal to verify mitigations are effective. These targeted steps go beyond generic advice by focusing on access control, monitoring, and minimizing attack surface specific to this vulnerability.