CVE-2026-82193 in Backup, Migration & Staging Plugin
Summary
by MITRE • 09/04/2026
The WPvivid — Backup, Migration & Staging WordPress plugin before 0.9.134 does not validate a user supplied file name before using it to build a write path, allowing administrators to write files of permitted types to arbitrary locations on the server and to overwrite existing files.
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Analysis
by VulDB Data Team • 09/04/2026
The vulnerability identified in WPvivid Backup, Migration & Staging versions prior to 0.9.134 represents a critical security flaw rooted in improper input validation regarding file path construction. This issue is classified under CWE-22 as Improper Limitation of a Pathname to a Restricted Directory, commonly known as directory traversal or path manipulation. The core technical failure occurs when the plugin accepts user-supplied filenames without sanitizing them for special characters such as dot-dot-slash sequences (../). By failing to validate these inputs before concatenating them into file system write operations, the application allows an attacker to manipulate the intended destination of a file write operation. This lack of validation enables the bypassing of expected directory boundaries, effectively granting unauthorized control over where data is written within the server's filesystem hierarchy.
From an operational perspective, this vulnerability poses severe risks to web infrastructure integrity and confidentiality. An authenticated administrator or any user with sufficient privileges to trigger backup or migration functions can exploit this flaw to write arbitrary files to sensitive locations on the server. This capability facilitates several malicious outcomes, including overwriting critical configuration files such as wp-config.php, which could lead to complete site compromise by altering database credentials or enabling remote code execution through injected PHP shells. Furthermore, attackers may use this mechanism to plant persistent backdoors in web-accessible directories, ensuring continued access even if the initial vulnerability is patched. The ability to overwrite existing files also allows for defacement of website content or disruption of service availability by corrupting essential system files.
The exploitation vector typically requires authentication due to the nature of WordPress plugin permissions, meaning this falls under CWE-269: Improper Privilege Management in terms of access control requirements. However, once authenticated privileges are obtained, the lack of path validation transforms a standard administrative function into a powerful arbitrary write primitive. This aligns with MITRE ATT&CK technique T1053, specifically Scheduled Task/Job or file system manipulation variants like T1204: User Execution if combined with social engineering to trick an admin into triggering specific actions, though the primary mechanism here is direct exploitation of the plugin's logic rather than user execution. The impact extends beyond simple defacement; it can lead to full server compromise depending on the permissions under which the web server process runs and the sensitivity of files accessible in traversed directories.
Mitigation strategies must prioritize immediate remediation through software updates. Administrators running WPvivid Backup, Migration & Staging should upgrade to version 0.9.134 or later where this input validation issue has been addressed by developers implementing strict allow-listing for file names and robust path canonicalization before any write operations occur. In the interim, if updating is not immediately feasible, restricting plugin capabilities via role management can limit exposure, although complete prevention requires code-level fixes that enforce absolute path verification against a predefined safe directory structure. Security monitoring should also be enhanced to detect unusual file creation patterns or modifications to critical system files in unexpected locations, serving as an early warning indicator for potential exploitation attempts targeting this specific weakness.