Persistent Cross-Site Scripting Vulnerability in MyBB Plugin
CVE-2018-25250

5.1MEDIUM

Key Information:

Vendor

Mybb

Status
Mybb Last User's Threads In Profile Plugin
Vendor
CVE Published:
4 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2018-25250?

The Last User's Threads in Profile Plugin for MyBB version 1.2 is susceptible to a persistent cross-site scripting vulnerability. This vulnerability allows attackers to inject malicious scripts into thread subjects, which execute when users view the attacker's profile page. By utilizing script tags within the thread title, an attacker can compromise user interactions and potentially steal sensitive information or manipulate user sessions.

Affected Version(s)

MyBB Last User's Threads in Profile Plugin 1.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2018-25250 - Proof of Concept

References

https://www.exploit-db.com/exploits/44339
exploit
https://community.mybb.com/mods.php?action=view&pid=910
product
https://www.vulncheck.com/advisories/mybb-last-user-s-thr...
third-party-advisory

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

0xB9
.