CVE-2023-53976CWE-79

myBB Forums 1.8.26 Stored Cross-Site Scripting via Template Management

Medium · published December 22, 2025

CVSS v4.0
5.1
EPSS
0%
Percentile
14.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
5.1 · MEDIUM
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
EPSS
0.00244 · 14.7th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2025-12-22T21:35Z
EPSS history
Timeline
  • 22 DEC 21:35Z
    myBB Forums 1.8.26 Stored Cross-Site Scripting via Template Management
    cvelistv5