JetBackup main-site administrators can download full multisite backups
JetBackup 3.1.18.8 through versions before 3.1.23.5 serves backup archives and job logs before enforcing its multisite authorization boundary. An administrator of the network's main site who is not a Super Admin can download a full network backup, including every site's data and the shared webroot.
- Component
- JetBackup
- Plugin slug
jetbackup- Affected
- 3.1.18.8 to < 3.1.23.5
- Safe version
3.1.23.5- Published
- Aug 27, 2026
This CVE was published Aug 27, 2026 and is one of 6 known issues for this plugin.
Update, patch or deactivate.
Update to 3.1.23.5 or later, audit backup downloads and job-log access, and rotate secrets contained in exposed archives when warranted.
A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical description
The JetBackup WordPress plugin before 3.1.23.5 does not perform its multisite authorisation check before serving backup archives and job logs, allowing an administrator of the network's main site who is not a Super Admin to download a full backup of the entire network, including every site's data and the shared webroot.
CVE / CNA vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N