Prime Mover WordPress plugin: Zip Slip path traversal in migration import
Summary
The Prime Mover backup and migration plugin for WordPress before version 2.2.1 contains a Zip Slip path traversal vulnerability in the ZIP import function. An authenticated administrator can supply a crafted ZIP archive whose entry names contain traversal sequences, so files are written outside the intended extraction directory. If the written files are interpreted by the web server, this can lead to remote code execution.
Affected
- Prime Mover WordPress plugin, all versions before 2.2.1 (CVE record: 0 to less than 2.2.1)
Fixed in
- Version 2.2.1 contains the fix according to the vendor changelog.
- Version 2.2.2 or later is recommended, because CVE-2026-115806 affects version 2.2.1.
Workaround
- No vendor-documented workaround. Update the plugin.
- Until the update is installed, deactivate or remove the plugin.
Exploitation
- Authentication required: an attacker needs an administrator account.
- Public proof of concept code is available from the finder's GitHub repository (not verified).
- Not listed in the CISA KEV catalog. CISA SSVC: exploitation none, not automatable, total technical impact.
- No known exploitation in the wild.
Our recommendation
- Inventory all WordPress sites that use Prime Mover.
- Update Prime Mover to version 2.2.2 or later without delay, because CVE-2026-115806 is a more severe unauthenticated issue in 2.2.1.
- Review administrator accounts, remove unused ones, and enforce multi-factor authentication for admin logins.
- Check the webroot for unexpected PHP files, especially those created around ZIP imports.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- WordPress.org Plugin Page: Prime Mover wordpress.org
- VulnCheck Advisory: Prime Mover Zip Slip Path Traversal File Write www.vulncheck.com
- OpenCVE: CVE-2026-101888 app.opencve.io
- ThreatInt CVE Record: CVE-2026-101888 cve.threatint.com
- Researcher PoC repository (sarvarr1) github.com
- VulDB: CVE-2026-115806 vuldb.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 1 Nov 2026, 09:27.
Original description (NVD)
The Prime Mover plugin for WordPress before 2.2.1 contains a Zip Slip path traversal vulnerability that allows authenticated administrators to write arbitrary files outside the intended extraction directory during migration ZIP import. Attackers can craft ZIP entry names with traversal sequences processed by computeExtractionParameters() and resumableZipExtractor() in utilities/PrimeMoverSystemCheckUtilities.php to write attacker-controlled content to arbitrary filesystem locations, potentially achieving remote code execution if the written files are interpreted by the web environment.
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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