Persistent Cross-Site Scripting Vulnerability in MyBB Recent Threads 17.0
CVE-2018-25309

5.1MEDIUM

Key Information:

Vendor

Mybb

Status
Mybb Recent Threads
Vendor
CVE Published:
29 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2018-25309?

The persistent cross-site scripting vulnerability in MyBB Recent Threads version 17.0 enables attackers to inject malicious JavaScript into the subject lines of threads. When users view the index page, the injected scripts execute in their browsers, compromising user sessions and data privacy. This vulnerability highlights the importance of sanitizing user inputs to safeguard against XSS attacks.

Affected Version(s)

MyBB Recent threads 17.0

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-2018-25309 - Proof of Concept

References

https://www.exploit-db.com/exploits/44420
exploit
https://community.mybb.com/mods.php?action=view&pid=191
product
https://www.vulncheck.com/advisories/mybb-recent-threads-...
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

Perileos
.