CVE-2026-18386 Path traversal in WP BackItUp Community Edition
Authenticated administrators can read arbitrary files on the server via a path traversal vulnerability in the backup_file parameter.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-18386?
CVE-2026-18386 is a medium-severity path traversal vulnerability in cssimmon WP BackItUp Community Edition, published on 10 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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.
Weakness: CWE-22
Which versions are affected by CVE-2026-18386?
How do I fix CVE-2026-18386?
No fix has been published for CVE-2026-18386 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-18386 being exploited?
There is no known exploitation of CVE-2026-18386 in the wild and no public exploit code.
Sources
Also known as GHSA-6237-95m6-mmw4.