Stored Cross-Site Scripting in myBB Forums Management System
CVE-2023-53977

5.1MEDIUM

Key Information:

Vendor

Mybb

Status
Mybb Forums
Vendor
CVE Published:
22 December 2025

Badges

👾 Exploit Exists

What is CVE-2023-53977?

myBB Forums 1.8.26 is susceptible to a stored cross-site scripting vulnerability within its forum management system. This flaw allows authenticated administrators to inject malicious scripts while creating new forums. When an attacker exploits this vulnerability, they can input script payloads into the forum title field during the 'Forums and Posts' > 'Forum Management' process. If successfully executed, arbitrary JavaScript can run on the user's browser, compromising the security of forum users and potentially leading to further malicious activities.

Affected Version(s)

myBB forums 1.8.26

References

https://www.exploit-db.com/exploits/51136
exploit
https://mybb.com/
product
https://www.vulncheck.com/advisories/mybb-forums-stored-c...
third-party-advisory

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
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

Andrey Stoykov
.