WordPress Plugin Vulnerabilities
Mailster - Email Newsletter Plugin for WordPress < 4.1.18 - Authenticated (Editor+) Arbitrary File Upload
Description
The Mailster WordPress Newsletter Plugin plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in all versions up to, and including, 4.1.17. This makes it possible for authenticated attackers, with Editor-level access and above, to upload arbitrary files on the affected site's server which may make remote code execution possible.
Affects Plugins
Fixed in 4.1.18 References
Miscellaneous
Original Researcher
Phat RiO
Verified
No
WPVDB ID
Timeline
Publicly Published
2026-07-22 (about 2 months ago)
Added
2026-07-29 (about 2 months ago)
Last Updated
2026-07-29 (about 2 months ago)
