CVE-2026-12898 Overview
CVE-2026-12898 is a path traversal vulnerability [CWE-22] in the All-in-One WP Migration and Backup WordPress plugin before version 7.106. The plugin fails to sanitize a user-supplied value before using it to construct a file path. Unauthenticated attackers can create or append log files in arbitrary filesystem locations outside the plugin's intended storage directory. The flaw is exploitable over the network without user interaction or privileges. The vulnerability carries a CVSS 3.1 score of 6.5 and affects a plugin installed on millions of WordPress sites, making it a broadly relevant integrity and availability issue for site operators.
Critical Impact
Unauthenticated remote attackers can write arbitrary log files outside the plugin's storage directory, enabling file creation abuse and potential chained attacks against WordPress installations.
Affected Products
- All-in-One WP Migration and Backup WordPress plugin versions prior to 7.106
- WordPress sites with the vulnerable plugin installed and active
- Any hosting environment where the plugin process has write access to sensitive filesystem locations
Discovery Timeline
- 2026-07-20 - CVE-2026-12898 published to NVD
- 2026-07-20 - Last updated in NVD database
Technical Details for CVE-2026-12898
Vulnerability Analysis
The vulnerability resides in the plugin's log-writing logic. The plugin accepts a user-supplied value and incorporates it into a file path used to create or append log entries. Because the input is not properly sanitized against directory traversal sequences such as ../, an attacker can redirect writes to locations outside the plugin's intended storage directory. The endpoint is reachable without authentication, so any remote actor able to send HTTP requests to the target site can trigger the write. See the WPScan Vulnerability Report for advisory details.
Root Cause
The root cause is missing input validation on a path component derived from attacker-controlled input. The plugin concatenates the tainted value into a filesystem path without normalizing traversal characters or enforcing a base-directory allowlist. This is a classic Improper Limitation of a Pathname to a Restricted Directory weakness [CWE-22].
Attack Vector
Exploitation requires only network access to the WordPress site and no authentication. An attacker sends a crafted HTTP request containing traversal sequences in the vulnerable parameter. The plugin resolves the manipulated path and writes or appends attacker-influenced log content to a chosen destination. Consequences include creating files that overlap with plugin or theme directories, corrupting existing writable files by appending log data, and staging content for later inclusion or code execution when combined with other weaknesses.
No verified public proof-of-concept code is available at the time of writing. Refer to the WPScan advisory for technical specifics on the vulnerable parameter and payload structure.
Detection Methods for CVE-2026-12898
Indicators of Compromise
- Unexpected files or log fragments appearing outside wp-content/ai1wm-backups/ or the plugin's standard storage directories
- HTTP requests to All-in-One WP Migration endpoints containing traversal sequences such as ../ or URL-encoded equivalents (%2e%2e%2f)
- Modified timestamps on WordPress core, theme, or plugin files that align with plugin log activity
- Web server error log entries showing file writes to unusual paths originating from the plugin process
Detection Strategies
- Inspect web access logs for POST or GET requests to admin-ajax.php and plugin routes referencing ai1wm with suspicious path parameters
- Deploy Web Application Firewall (WAF) rules that block traversal patterns in parameters targeting All-in-One WP Migration endpoints
- Run filesystem integrity monitoring against WordPress directories to flag out-of-baseline file creation or modification
Monitoring Recommendations
- Enable verbose PHP and web server logging for requests hitting the plugin's AJAX handlers
- Correlate unauthenticated request spikes with file creation events on the WordPress host
- Alert on any writes performed by the PHP process to directories outside expected upload and backup paths
How to Mitigate CVE-2026-12898
Immediate Actions Required
- Upgrade the All-in-One WP Migration and Backup plugin to version 7.106 or later on every WordPress instance
- Audit wp-content and adjacent directories for unexpected log files or modified assets created before the update
- Restrict plugin AJAX endpoints via WAF rules until patching is confirmed across all sites
Patch Information
The vendor addressed the flaw in All-in-One WP Migration and Backup version 7.106. The fix enforces sanitization of the user-supplied value used to build the log file path, preventing directory traversal outside the plugin's storage directory. Consult the WPScan Vulnerability Report for the authoritative advisory reference.
Workarounds
- Temporarily deactivate the All-in-One WP Migration and Backup plugin on sites that cannot be patched immediately
- Apply WAF signatures that reject requests containing ../ or encoded traversal sequences against plugin endpoints
- Tighten filesystem permissions so the PHP-FPM or web server user cannot write outside required WordPress directories
# Configuration example: WP-CLI update to patched version
wp plugin update all-in-one-wp-migration --version=7.106
wp plugin get all-in-one-wp-migration --field=version
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
