CVE-2026-4031: Authorization Bypass in Database Backup for WordPress
Platform
wordpress
Component
wp-db-backup
Fixed in
2.5.3
CVE-2026-4031 describes an authorization bypass vulnerability affecting the Database Backup for WordPress plugin. An unauthenticated attacker can exploit this flaw to intercept database backup files, potentially gaining access to sensitive information. This vulnerability impacts versions of the plugin up to and including 2.5.2. A fix is available in version 2.5.3.
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Impact and Attack Scenarios
Successful exploitation of CVE-2026-4031 allows an attacker to intercept database backup files created by the plugin. These backups often contain sensitive data, including user credentials, database schemas, and application configuration details. By controlling the wpdbtemp_dir parameter, an attacker can dictate where these backups are written, choosing a publicly accessible location like the wp-content/uploads/ directory. The predictable naming convention of the backup files makes interception relatively straightforward. This could lead to complete compromise of a WordPress site and its associated data, similar to scenarios where attackers have exploited misconfigured file storage locations to steal sensitive information.
Exploitation Context
CVE-2026-4031 was published on May 13, 2026. Its severity is rated HIGH with a CVSS score of 7.5. There is currently no indication of this vulnerability being actively exploited in the wild, nor is it listed on KEV or EPSS. Public proof-of-concept (POC) code is not yet available, but the vulnerability's nature makes it relatively easy to exploit, increasing the likelihood of future exploitation if left unpatched.
Threat Intelligence
Exploit Status
CVSS Vector
What do these metrics mean?
- Attack Vector
- Network — remotely exploitable over the internet. No physical or local access required. Widest attack surface.
- Attack Complexity
- Low — no special conditions required. Attacker can exploit reliably without depending on rare configurations or timing.
- Privileges Required
- None — unauthenticated. No login or credentials needed to exploit.
- User Interaction
- None — attack is automatic and silent. Victim does nothing: no click, no file open.
- Scope
- Unchanged — impact is limited to the vulnerable component itself.
- Confidentiality
- High — complete confidentiality loss. Attacker can read all data: credentials, keys, personal data.
- Integrity
- None — no integrity impact. Attacker cannot modify data.
- Availability
- None — no availability impact. Service remains fully operational.
Affected Software
Weakness Classification (CWE)
Timeline
- Reserved
- Published
Mitigation and Workarounds
The primary mitigation for CVE-2026-4031 is to immediately upgrade the Database Backup for WordPress plugin to version 2.5.3 or later. If upgrading is not immediately feasible due to compatibility issues or breaking changes, consider restricting access to the wpdbtempdir directory. Implement strict file permissions, ensuring that only the webserver user has write access. Additionally, monitor the wp-content/uploads/ directory and other potential public locations for unexpected files with predictable naming patterns. While not a direct fix, a Web Application Firewall (WAF) could be configured to block requests containing suspicious values for the wpdbtempdir parameter. After upgrading, verify the fix by manually triggering a database backup and confirming that the backup file is not accessible from a web browser.
How to fix
Update to version 2.5.3, or a newer patched version
Frequently asked questions
What is CVE-2026-4031 — Authorization Bypass in Database Backup for WordPress?
CVE-2026-4031 is a HIGH severity vulnerability in the Database Backup for WordPress plugin that allows unauthenticated attackers to intercept database backups by manipulating the wpdbtemp_dir parameter, potentially exposing sensitive data.
Am I affected by CVE-2026-4031 in Database Backup for WordPress?
You are affected if you are using the Database Backup for WordPress plugin version 2.5.2 or earlier. Upgrade to version 2.5.3 to mitigate the risk.
How do I fix CVE-2026-4031 in Database Backup for WordPress?
The recommended fix is to upgrade the Database Backup for WordPress plugin to version 2.5.3 or later. If upgrading is not possible immediately, restrict access to the wpdbtemp_dir directory.
Is CVE-2026-4031 being actively exploited?
There is currently no evidence of CVE-2026-4031 being actively exploited in the wild, but the ease of exploitation suggests a potential risk if left unpatched.
Where can I find the official Database Backup for WordPress advisory for CVE-2026-4031?
Please refer to the official Database Backup for WordPress plugin website or WordPress.org plugin repository for the latest advisory and update information regarding CVE-2026-4031.
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