CVE-2026-18216

Backup Migration < 2.1.7 - Admin+ Privilege Escalation via Post-Restore Auto-Login

The Backup Migration WordPress plugin before 2.1.7 does not properly restrict a post-restore automatic login mechanism, allowing a user who administers one site of a multisite network to obtain a long-lived authenticated session as an administrator of another site in the same network, without credentials and bypassing two-factor authentication.

Affected

Backup Migration

CVSS v3.1 CNA

6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

EPSS

0.51% chance of exploitation in the next 30 days, 42nd percentile

Published

2026-08-15

Updated

2026-08-17

Proof-of-concept exploits (1)

• https://wpscan.com/vulnerability/f12530c5-4069-42c2-9f1c-b00fc62aa387/

References

• CVE Record
• NVD entry