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CVE-2026-18386— WP BackItUp Community Edition <= 2.1.0 - Authenticated (Administrator+) Path Traversal to Arbitrary File Read via 'backup_file' Parameter

Quick assessment

Affected
cssimmon WP BackItUp Community Edition
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 的 WP BackItUp Community Edition 插件在所有版本中（包括 2.1.0 及更早版本）均存在目录遍历（Directory Traversal）漏洞，该漏洞通过 参数触发。此漏洞使得具有管理员级别或更高权限的已认证攻击者能够读取服务器上的任意文件内容，而这些文件可能包含敏感信息。处理程序中现有的 规范化操作仅在被遍历的目标路径不存在时才会执行，因此对于读取已存在的文件几乎没有防护作用。

CVSS 4.9 · Medium

Possible ATT&CK Techniques 1 AI

T1213 · Data from Information Repositories
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I. Basic Information for CVE-2026-18386

Vulnerability Information
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Vulnerability Title
WP BackItUp Community Edition <= 2.1.0 - Authenticated (Administrator+) Path Traversal to Arbitrary File Read via 'backup_file' Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
cssimmon WP BackItUp Community Edition 0 ~ 2.1.0 -

II. Public POCs for CVE-2026-18386

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III. Intelligence Information for CVE-2026-18386

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Vendor Pages for CVE-2026-18386 (1)

Other References for CVE-2026-18386 (6)

IV. Related Vulnerabilities

Same weakness: CWE-22

V. Comments for CVE-2026-18386

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