Administrator-level arbitrary file read via path traversal
Published Sep 10, 2026 · Updated Sep 10, 2026
Path traversal in WP BackItUp Community Edition 2.1.0 and earlier allows remote authenticated users to read arbitrary server files. The download handler accepts the backup_file parameter as a filesystem path and applies basename() only when the requested path does not exist, leaving existing traversed paths unchanged. Administrator-level WordPress access is required, and exploitation discloses files readable by the web-server process.
Summary
What happened
Path traversal in WP BackItUp Community Edition 2.1.0 and earlier allows remote authenticated users to read arbitrary server files. The download handler accepts the backup_file parameter as a filesystem path and applies basename() only when the requested path does not exist, leaving existing traversed paths unchanged. Administrator-level WordPress access is required, and exploitation discloses files readable by the web-server process.
The record
- CVE
- CVE-2026-18386
- Published
- Sep 10, 2026
- Updated
- Sep 10, 2026
- Vendor
- Chris Simmons
- Product
- WP BackItUp Community Edition
- Classifications
- CWE-22, T1005
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Sep 10, 2026CVE publishedPublication date reported by the CVE source.
- Sep 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=2.1.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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