CVE-2023-53976 MEDIUM

CVE-2023-53976: myBB Forums 1.8.26 Stored Cross-Site Scripting via Template Management

Vendor Mybb

Product myBB forums

Weakness CWE-79 · XSS

Published December 22, 2025

Last update April 7, 2026

View on NVD All CVEs

CVSS base score

5.1/10

Attack vector Network

Attack complexity Low

Privileges required Low

User interaction —

Confidentiality —

Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

December 22, 2025 CVE published

April 7, 2026 Record updated

External resources

03References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2023-53976 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/79.html