Unrated severityNVD Advisory· Published Dec 22, 2025· Updated Apr 7, 2026
myBB Forums 1.8.26 Stored Cross-Site Scripting via Template Management
CVE-2023-53976
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.
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Affected products
1- Range: = 1.8.26
Patches
Vulnerability mechanics
References
3- www.exploit-db.com/exploits/51136mitreexploit
- www.vulncheck.com/advisories/mybb-forums-stored-cross-site-scripting-via-template-managementmitrethird-party-advisory
- mybb.commitreproduct
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