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High · 7.2 CVE-2018-25309 EUVD-2018-21830GHSA-gcf4-8qvj-pjm9

MyBB Recent threads 17.0 Persistent Cross-Site Scripting

Published Apr 29, 2026 · Updated May 24, 2026 · Assigned by VulnCheck

Description

MyBB Recent threads 17.0 contains a persistent cross-site scripting vulnerability that allows attackers to inject malicious scripts by creating threads with crafted subject lines. Attackers can create threads with script tags in the subject parameter to execute arbitrary JavaScript in the browsers of all users viewing the index page.

Affected products

VendorProductAffectedFixed
mybb MyBB Recent threads 17.0 —

References