Insecure Authentication in Backup Migration Plugin for WordPress Multisite Networks
CVE-2026-18216

Currently unrated

Key Information:

Vendor

WordPress
Status
Backup Migration
Vendor
CVE Published:
15 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-18216?

The Backup Migration plugin for WordPress, prior to version 2.1.7, contains a security flaw whereby it fails to adequately restrict the automatic login feature following a restoration of backups. This oversight permits a user with administrative privileges on one site within a multisite network to gain unauthorized administrative access to another site in the same network. The vulnerability simplifies the process of session hijacking, allowing the malicious actor to obtain a long-lived authenticated session without needing valid credentials or bypassing two-factor authentication mechanisms.

Affected Version(s)

Backup Migration 0 < 2.1.7

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-18216 - Proof of Concept

References

https://wpscan.com/vulnerability/f12530c5-4069-42c2-9f1c-...
exploitvdb-entrytechnical-description

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Thanh Lam Tang
WPScan
.