Security Advisory

CVE-2026-45127

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-08-18 15:38:41

Last updated 2026-08-19 14:39:44

Assigner GitHub_M

CVSS score 3.5

State PUBLISHED

Description

MyBB is free and open source forum software. Prior to 1.8.40, the ACP Mass Mail module does not validate certain requests correctly, allowing same-site attackers to create draft entries from archived entries by embedding a specially crafted URL. The Resend route in Admin CP, Users & Groups, Mass Mail, Mass Mailing Archive duplicates archived mailing entries into new drafts with mybb_massemails.status set to 0 on GET requests without request forgery protection. The uniquely identifying implementation details include Users & Groups → Mass Mail → Mass Mailing Archive, mybb_massemails.status = 0, and admin/modules/user/mass_mail.php. This issue is fixed in version 1.8.40.

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