CVE-2026-4030: Arbitrary File Access in Database Backup for WordPress
Platform
wordpress
Component
wp-db-backup
Fixed in
2.5.3
CVE-2026-4030 describes an Arbitrary File Access vulnerability discovered in the Database Backup for WordPress plugin. This flaw allows unauthenticated attackers to read and delete files on the server, potentially leading to sensitive information exposure and complete site compromise. The vulnerability affects versions 1.0.0 through 2.5.2 of the plugin, and a fix is available in version 2.5.3.
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Impact and Attack Scenarios
The impact of CVE-2026-4030 is significant, particularly within WordPress Multisite environments. An attacker exploiting this vulnerability can gain unauthorized access to sensitive files, including configuration files, database credentials, and potentially even source code. Successful exploitation could lead to the disclosure of confidential data, modification of website content, or even complete site takeover. The ability to delete arbitrary files further exacerbates the risk, potentially disrupting website operations and causing data loss. This vulnerability shares similarities with other file access vulnerabilities where improper authorization checks allow attackers to bypass security controls.
Exploitation Context
CVE-2026-4030 was published on 2026-05-14. Its severity is rated HIGH (CVSS 8.1). Public proof-of-concept (POC) code is currently unknown, but the vulnerability's nature suggests it could be easily exploited. The vulnerability is specifically exploitable in WordPress Multisite environments. There is no indication of active exploitation campaigns at this time, but the ease of exploitation warrants immediate attention and patching.
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
- High — requires a race condition, non-default configuration, or specific circumstances. Harder to exploit reliably.
- 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
- High — attacker can write, modify, or delete any data: databases, config files, or code.
- Availability
- High — complete crash or resource exhaustion. Full denial of service.
Affected Software
Weakness Classification (CWE)
Timeline
- Reserved
- Published
- Modified
Mitigation and Workarounds
The primary mitigation for CVE-2026-4030 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 implementing a temporary workaround by restricting access to the plugin's backup directory. This can be achieved through file system permissions or web server configuration. While not a complete solution, this can limit the attacker's ability to read or delete files. Monitor WordPress logs for any unusual file access attempts, particularly those originating from unauthenticated users. After upgrading, verify the fix by attempting to access a non-public file through the plugin's interface; access should be denied.
How to fix
Update to version 2.5.3, or a newer patched version
Frequently asked questions
What is CVE-2026-4030 — Arbitrary File Access in Database Backup for WordPress?
CVE-2026-4030 is a HIGH severity vulnerability in the Database Backup for WordPress plugin allowing unauthenticated attackers to read and delete files. It affects versions 1.0.0–2.5.2, potentially leading to sensitive information exposure and site takeover.
Am I affected by CVE-2026-4030 in Database Backup for WordPress?
You are affected if you are using the Database Backup for WordPress plugin in versions 1.0.0 through 2.5.2, especially if you are running a WordPress Multisite environment.
How do I fix CVE-2026-4030 in Database Backup for WordPress?
Upgrade the Database Backup for WordPress plugin to version 2.5.3 or later. As a temporary workaround, restrict access to the plugin's backup directory through file system permissions or web server configuration.
Is CVE-2026-4030 being actively exploited?
There is currently no indication of active exploitation campaigns, but the vulnerability's ease of exploitation warrants immediate attention and patching.
Where can I find the official Database Backup for WordPress advisory for CVE-2026-4030?
Refer to the official Database Backup for WordPress plugin website or WordPress.org plugin page for the latest advisory and update information regarding CVE-2026-4030.
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