CVE-2023-53978CWE-79

myBB Forums 1.8.26 Stored Cross-Site Scripting via Forum Announcements

Medium · published December 22, 2025

CVSS v4.0
5.1
EPSS
0%
Percentile
13.9
In the wild
Unconfirmed
What it is

myBB Forums 1.8.26 contains a stored cross-site scripting vulnerability in the forum announcement system that allows authenticated administrators to inject malicious scripts when creating announcements. Attackers can exploit this vulnerability by inserting script payloads in the announcement title field when adding announcements through the 'Forums and Posts' > 'Forum Announcements' interface, causing arbitrary JavaScript to execute when the announcement is displayed on the forum.

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
0.00236 · 13.9th 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 Forum Announcements
    cvelistv5