Stored Cross-Site Scripting in myBB Forums for Template Management
CVE-2023-53976

5.1MEDIUM

Key Information:

Vendor

Mybb

Status
Mybb Forums
Vendor
CVE Published:
22 December 2025

Badges

👾 Exploit Exists

What is CVE-2023-53976?

The myBB Forums 1.8.26 is prone to a stored cross-site scripting vulnerability that affects its template management system. This vulnerability permits authenticated administrators to insert arbitrary JavaScript through the template title field when creating new templates. When the malicious template is accessed, it can execute the unauthorized scripts, potentially compromising the integrity of the forums and the data therein. Exploiting this flaw can result in severe consequences for both the administrators and the end users.

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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
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