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Medium · 5.3 CVE-2021-47934 EUVD-2021-34840GHSA-9cv3-xr79-r4jw

MyBB Timeline Plugin 1.0 Cross-Site Scripting and CSRF

Published May 16, 2026 · Updated May 18, 2026 · Assigned by VulnCheck

Description

MyBB Timeline Plugin 1.0 contains cross-site scripting vulnerabilities that allow attackers to inject malicious scripts through thread titles, post content, and user profile fields like Location and Bio. Attackers can also exploit a cross-site request forgery vulnerability in the timeline.php profile action to change a user's cover picture by crafting malicious forms that execute when victims visit affected profiles.

Affected products

VendorProductAffectedFixed
MyBB MyBB Timeline Plugin 1.0 —

References