CVE-2018-25309 - CVE House
Back to Database
Status published Medium CVE-2018-25309

MyBB Recent threads 17.0 Persistent Cross-Site Scripting

Vulnerability Description

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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2018-25309

Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Perileos

References

More from mybb

View All →
CVE-2025-48941
MyBB may disclosure unviewable threads' titles in searches
Medium 5.3
CVE-2025-48940
MyBB's upgrade component vulnerable to local file inclusion
High 7.2
CVE-2024-23336
Incomplete disallowed remote addresses list in MyBB
Medium 5
CVE-2024-23335
Backups directory .htaccess deletion in. MyBB
Medium 4.7
CVE-2023-46251
Visual editor persistent Cross-site Scripting (XSS) in MyBB
High 7.5

Affected Vendor

Affected Software

MyBB Recent threads
Vulnerable Versions:
17.0

Timeline

Official Publish: April 29th, 2026
Last Modified: May 24th, 2026
Added to House: July 20th, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Weaknesses (CWE)

CWE-79

MITRE ATT&CK TTPs

T1189 Drive-by Compromise
Initial Access
T1059.007 JavaScript
Execution
T1539 Steal Web Session Cookie
Collection
T1213 Data from Information Repositories
Collection
T1567 Exfiltration Over Web Service
Exfiltration
T1491.001 Defacement
Impact