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TI-2026-04236 Aliases CVE-2026-4853GHSA-8cfg-qq42-h3w8

Path traversal in backupguard JetBackup – Backup, Restore & Migrate

Priority LOW 24CWE-22Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-22 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00713 53rd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
backupguardJetBackup – Backup, Restore & Migrateup to 3.1.19.8—No fix listedCNA
  • JetBackup – Backup, Restore & Migrate Vendorbackupguard Affected up to 3.1.19.8 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:jetbackup:jetbackup:*:*:*:*:*:*:*:*——JetBackup
  • cpe:2.3:a:jetbackup:jetbackup:*:*:*:*:*:*:*:* Versions — — ·JetBackup

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-4853
  2. 2026-10-03 Alias added: GHSA-8cfg-qq42-h3w8
  3. 2026-10-25 EPSS moved to the 50th–90th percentile

References

Other 8

  • TI-2021-06447 Backup Guard < 1.6.0 - Authenticated Arbitrary File Upload CVSS 3.1HIGH 7.2
  • TI-2020-18861 JetBackup – WP Backup, Migrate & Restore <= 1.3.9 - Cross-Site Request Forgery to Arbitrary File Upload CVSS 3.1HIGH 8.8
  • TI-2017-13661 The Backup Guard plugin before 1.1.47 for WordPress has multiple XSS issues. CVSS 3.0MEDIUM 6.1
  • TI-2017-07938 Cross-site scripting in BackupGuard CVSS 3.1MEDIUM 6.1
  • TI-2020-18859 JetBackup – WP Backup, Migrate & Restore <= 1.4.1 - Missing Authorization to Unauthorized Backup Location Change CVSS 3.1MEDIUM 5.4
  • TI-2020-18860 JetBackup – WP Backup, Migrate & Restore <= 1.4.0 - Sensitive Information Disclosure CVSS 3.1MEDIUM 4.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences