# Prime Mover – Backup and Migration <= 2.2.1 - Unauthenticated PHP Object Injection via Stored Content Processed During Migration Search-Replace

- **ID:** WPSEC-2026-1305
- **Plugin:** Prime Mover – Backup and Migration (`prime-mover`), https://wordpress.org/plugins/prime-mover/
- **Affected versions:** all versions before 2.2.2
- **Fixed in:** 2.2.2 (Update to 2.2.2 or later.)
- **Severity:** High 7.5 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H)
- **Weakness:** CWE-502
- **Usage among sites WPSec scans:** plugin Low, affected versions Low (as of 2026-10-21)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/prime-mover
- **Fix released:** 2026-10-19
- **Published:** 2026-10-21
- **URL:** https://wpsec.com/vuln/WPSEC-2026-1305/

## Description

The Prime Mover – Backup and Migration plugin for WordPress is vulnerable to PHP Object Injection via the database search-and-replace step of a migration or restore in all versions up to, and including, 2.2.1. This is due to deserialization of untrusted input: every database value that contains a search string (such as the old site URL) is passed to unserialize() with no class restriction, and the result is unserialized again if it is itself a string. This makes it possible for unauthenticated attackers to plant a serialized PHP object in stored content, such as a comment. The object is instantiated when an administrator later migrates or restores the site. No known POP chain is present in the vulnerable software itself. If a POP chain is present through another plugin or theme on the target system, it could let the attacker delete arbitrary files, retrieve sensitive data, or execute code.

## References

- https://wpsec.com/vuln/WPSEC-2026-1305/
- https://plugins.svn.wordpress.org/prime-mover/tags/2.2.2/
- https://wordpress.org/plugins/prime-mover/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-1305/

License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Free to use, share and adapt, also commercially, if you credit WPSec and link to this advisory.