Vulnerability · Published Dec 22, 2025 · Assigned by VulnCheck
CVE-2023-53976myBB Forums 1.8.26 Stored Cross-Site Scripting via Template Management
Medium 5.4
In plain English
A medium-severity cross-site scripting in myBB forums from Mybb. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities).
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mybb | myBB forums | 1.8.26 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N