WP Database Backup <= 7.11 - Authenticated (Administrator+) OS Command Injection via 'wp_db_exclude_table' Parameter

Summary

CVE	CVE-2026-9834
State	PUBLISHED
Assigner	Wordfence
Source Priority	CVE Program / NVD first with legacy fallback
Published	2026-07-02 10:16:29 UTC
Updated	2026-07-02 13:58:56 UTC
Description	The WP Database Backup – Unlimited Database & Files Backup by Backup for WP plugin for WordPress is vulnerable to OS Command Injection in all versions up to and including 7.11 via the `wp_db_exclude_table` parameter. This is due to the direct concatenation of user-supplied `$_POST['wp_db_exclude_table']` values into the `mysqldump` shell command string in the `mysqldump()` function of `includes/admin/class-wpdb-admin.php` without wrapping them in `escapeshellarg()`—every other argument in the same command (DB_USER, DB_PASSWORD, host, filename, DB_NAME) is properly escaped, making the exclude-table values the sole exception—and because the only applied filtering, `sanitize_text_field()` via `recursive_sanitize_text_field()`, strips HTML tags but leaves shell metacharacters such as `;`, `\|`, `` ` ``, and `$()` intact. This makes it possible for authenticated attackers, with administrator-level access and above, to execute arbitrary operating system commands on the server, potentially enabling full remote code execution. The injection is stored: malicious values submitted through the plugin settings form are persisted to the WordPress options table via `update_option('wp_db_exclude_table')` and later retrieved with `get_option()` and passed unsanitized to `shell_exec()` whenever a backup operation runs.

Risk And Classification

Primary CVSS: v3.1 7.2 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.015880000 probability, percentile 0.726530000 (date 2026-07-04)

Problem Types: CWE-77 | CWE-77 CWE-77 Improper Neutralization of Special Elements used in a Command ('Command Injection')

Version	Source	Type	Score	Severity	Vector
3.1	[email protected]	Secondary	7.2	HIGH	`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`
3.1	CNA	DECLARED	7.2	HIGH	`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`

CVSS v3.1 Breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

Source	Vendor	Product	Version	Platforms
CNA	Databasebackup	WP Database Backup Unlimited Database Files Backup By Backup For WP	affected 7.11 semver	Not specified

References

Reference	Source	Link	Tags
plugins.trac.wordpress.org/browser/wp-database-backup/tags/7.10/includes/admin/class-wpd...	[email protected]	plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/wp-database-backup/tags/7.10/includes/admin/class-wpd...	[email protected]	plugins.trac.wordpress.org
plugins.trac.wordpress.org/changeset	[email protected]	plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/0a97a217-b00b-4268-a472-8d62a...	[email protected]	www.wordfence.com
plugins.trac.wordpress.org/browser/wp-database-backup/tags/7.10/includes/admin/class-wpd...	[email protected]	plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/wp-database-backup/tags/7.11/includes/admin/class-wpd...	[email protected]	plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/wp-database-backup/tags/7.11/includes/admin/class-wpd...	[email protected]	plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/wp-database-backup/tags/7.11/includes/admin/class-wpd...	[email protected]	plugins.trac.wordpress.org
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Irwan Kusuma (en)

Additional Advisory Data

Source	Time	Event
CNA	2026-07-01T00:00:00.000Z	Disclosed

There are currently no legacy QID mappings associated with this CVE.