Auth bypass in Jetbackup

CVE-2026-19454

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.

Vulnerability class: Broken Access Control

Published · last modified .

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.002 (14.7th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 14.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-19454: held from 0.003 to 0.002.

EPSS over last 30 days · oldest: 0.003 · newest: 0.002 · change: -0.000

Affected products

  • Jetbackup

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-19454?
CVE-2026-19454 is a medium-severity vulnerability in Jetbackup, classified under Incorrect Authorization. CVSS score: 4.4/10. Published 2026-08-27.
How severe is CVE-2026-19454?
Medium severity. CVSS v3 base score is 4.4 out of 10.