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OpenAdvisories
Medium · 5.4 CVE-2023-53976 EUVD-2023-60238GHSA-wf3v-cq62-6r54

myBB Forums 1.8.26 Stored Cross-Site Scripting via Template Management

Published Dec 22, 2025 · Updated Apr 7, 2026 · Assigned by VulnCheck

Description

myBB Forums 1.8.26 contains a stored cross-site scripting vulnerability in the template management system that allows authenticated administrators to inject malicious scripts when creating new templates. Attackers can exploit this vulnerability by inserting script payloads in the template title field when adding new templates through the 'Templates and Style' > 'Templates' > 'Manage Templates' > 'Global Templates' interface, causing arbitrary JavaScript to execute when the template is viewed.

Affected products

VendorProductAffectedFixed
Mybb myBB forums 1.8.26 —

References