JetBackup <= 3.1.19.8 — Authenticated (Administrator+) Arbitrary Directory Deletion via Path Traversal in 'fileName' Parameter
CVE-2026-4853Published · Updated Action summary
Affected: ≤3.1.19.8Update to 3.1.20.3 or newer
All remediation steps- Severity
- Medium4.9
- CVSS
- 4.9CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:HPrivileges required- High
UI:NUser interaction- None
S:UScope- Unchanged
C:HConfidentiality- High
I:NIntegrity- None
A:NAvailability- None
- Weakness
- CWE-22 Path Traversal
- Required access
- Unknown
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
JetBackup – Backup, Restore & Migrate backup
- Affected≤ 3.1.19.8
- Patched in3.1.20.3
Update to 3.1.20.3 or newer.
You are affected if you run ≤ 3.1.19.8. Version 3.1.20.3 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under JetBackup – Backup, Restore & Migrate.
- No admin access? Run a passive check of your site. It reads public files only.
What to do
- Update to version 3.1.20.3, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch JetBackup – Backup, Restore & Migrate to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to lucsob.
The JetBackup – Backup, Restore & Migrate plugin for WordPress is vulnerable to Path Traversal leading to Arbitrary Directory Deletion in versions up to and including 3.1.19.8. This is due to insufficient input validation on the fileName parameter in the file upload handler. The plugin sanitizes the fileName parameter using sanitize_text_field(), which removes HTML tags but does not prevent path traversal sequences like '../'. The unsanitized filename is then directly concatenated in Upload::getFileLocation() without using basename() or validating the resolved path stays within the intended directory. When an invalid file is uploaded, the cleanup logic calls dirname() on the traversed path and passes it to Util::rm(), which recursively deletes the entire resolved directory. This makes it possible for authenticated attackers with administrator-level access to traverse outside the intended upload directory and trigger deletion of critical WordPress directories such as wp-content/plugins, effectively disabling all installed plugins and causing severe site disruption.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in JetBackup – Backup, Restore & Migrate
All 13| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium4.7 | Authenticated (Admin+) Arbitrary File Write ≤3.1.24.9Update to 3.1.24.10 | CVE-2026-104068 | |
| Medium6.3 | 3.1.23.3 - Authenticated (Subscriber+) Privilege Escalation 3.1.7.9 – 3.1.23.3Update to 3.1.23.5 | CVE-2026-19453 | |
| Medium4.9 | 3.1.23.3 - Authenticated (Admin+) Backup Download 3.1.18.8 – 3.1.23.3Update to 3.1.23.5 | CVE-2026-19454 | |
| Critical9.8 | Sensitive Information Exposure via Directory Listing ≤2.0.9.7Update to 2.0.9.9 | CVE-2023-7165 | |
| Medium5.5 | Authenticated (Administrator+) Stored Cross-Site Scripting ≤1.6.9Update to 1.6.9.1 | CVE-2022-34148 |
- Medium4.7Authenticated (Admin+) Arbitrary File Write
≤3.1.24.9Update to 3.1.24.10
- Medium6.33.1.23.3 - Authenticated (Subscriber+) Privilege Escalation
3.1.7.9 – 3.1.23.3Update to 3.1.23.5
- Medium4.93.1.23.3 - Authenticated (Admin+) Backup Download
3.1.18.8 – 3.1.23.3Update to 3.1.23.5
- Critical9.8Sensitive Information Exposure via Directory Listing
≤2.0.9.7Update to 2.0.9.9
- Medium5.5Authenticated (Administrator+) Stored Cross-Site Scripting
≤1.6.9Update to 1.6.9.1
Same weakness (Path Traversal)
All Path Traversal| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header | CVE-2026-120688 | |
| Critical9.8 | Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission | CVE-2026-125055 | |
| Critical9.8 | Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter | CVE-2026-119077 | |
| Medium5.3 | Unauthenticated Sensitive Information Exposure in 'search' Parameter | CVE-2026-121518 |
- High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup
≤5.25.25Update to 5.26.45
- Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder
≤1.0.2Update to 1.1
- Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System
≤3.3.9Update to 3.4.0
- Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce
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Timeline
CVE published
Severity medium, CVSS 4.9
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. [object Object] Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- [object Object]. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.