CVE-2018-25309CWE-79

MyBB Recent threads 17.0 Persistent Cross-Site Scripting

Medium · published April 29, 2026

CVSS v4.0
5.1
EPSS
0%
Percentile
17.0
In the wild
Unconfirmed
What it is

MyBB Recent threads 17.0 contains a persistent cross-site scripting vulnerability that allows attackers to inject malicious scripts by creating threads with crafted subject lines. Attackers can create threads with script tags in the subject parameter to execute arbitrary JavaScript in the browsers of all users viewing the index page.

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:N/VI:N/VA:N/SC:L/SI:L/SA:N
EPSS
0.00261 · 17.0th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-04-29T19:24Z
EPSS history
Timeline
  • 29 APR 19:24Z
    MyBB Recent threads 17.0 Persistent Cross-Site Scripting
    cvelistv5