---
id: CVE-2026-18386
title: >-
  WP BackItUp Community Edition <= 2.1.0 - Authenticated (Administrator+) Path
  Traversal to Arbitrary File Read via 'backup_file' Parameter
summary: >-
  The WP BackItUp Community Edition plugin for WordPress is vulnerable to
  Directory Traversal in all versions up to, and including, 2.1.0 via the
  'backup_file' parameter parameter. This makes it possible for authenticated
  attackers, with a…
severity: medium
cvss: 4.9
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N'
cvssSource: cna
cwe:
  - CWE-22
vendor: cssimmon
product: WP BackItUp Community Edition
affected:
  - wp_backitup_community_edition <= 2.1.0
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-10T20:37:00.758828Z'
published: '2026-09-10'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T21:00:26.535Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-18386'
references:
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/50272c8a-2e23-490d-8865-68ae49228895?source=cve
  - url: >-
      https://plugins.trac.wordpress.org/browser/wp-backitup/tags/2.1.0/lib/includes/handler_download.php#L77
  - url: >-
      https://plugins.trac.wordpress.org/browser/wp-backitup/tags/2.1.0/lib/includes/handler_download.php#L73
  - url: >-
      https://plugins.trac.wordpress.org/browser/wp-backitup/tags/2.1.0/lib/includes/handler_download.php#L30
  - url: >-
      https://plugins.trac.wordpress.org/browser/wp-backitup/tags/2.1.0/lib/includes/class-wpbackitup-admin.php#L1391
  - url: >-
      https://plugins.trac.wordpress.org/browser/wp-backitup/tags/2.0.0/lib/includes/handler_download.php#L77
  - url: >-
      https://plugins.trac.wordpress.org/browser/wp-backitup/tags/2.0.0/lib/includes/handler_download.php#L73
  - url: >-
      https://plugins.trac.wordpress.org/browser/wp-backitup/tags/2.0.0/lib/includes/handler_download.php#L30
  - url: >-
      https://plugins.trac.wordpress.org/browser/wp-backitup/tags/2.0.0/lib/includes/class-wpbackitup-admin.php#L1391
tags:
  - cve.org
epss: 0.00725
epssPercentile: 0.52093
ingestedAt: '2026-09-11T16:45:48.023Z'
---

## Overview

The WP BackItUp Community Edition plugin for WordPress is vulnerable to Directory Traversal in all versions up to, and including, 2.1.0 via the 'backup_file' parameter parameter. This makes it possible for authenticated attackers, with administrator-level access and above, to read the contents of arbitrary files on the server, which can contain sensitive information. The basename() normalization present in the handler only executes when the traversed target path does not exist, providing no protection against reads of existing files.

## Affected

- `wp_backitup_community_edition <= 2.1.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.