Chained Vulnerability in MyBB 1.8.32 Allows Code Execution via Unsanitized Avatar Uploads
CVE-2023-53979

8.6HIGH

Key Information:

Vendor

Mybb

Status
Mybb
Vendor
CVE Published:
22 December 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2023-53979?

MyBB 1.8.32 features a chained vulnerability that enables authenticated administrators to bypass critical avatar upload restrictions. This flaw allows attackers to change upload path settings and introduce a malicious PHP-embedded image file, facilitating the execution of arbitrary commands through the language configuration editing interface. This security oversight poses a significant risk by providing unauthorized access and control over the application.

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Affected Version(s)

MyBB MyBB 1.8.32

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-2023-53979 - Proof of Concept

References

https://www.exploit-db.com/exploits/51213
exploit
https://mybb.com/
product
https://fdlucifer.github.io/2023/01/17/mybb1-8-32-LFI-RCE/
technical-description

CVSS V4

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

lUc1f3r11
JSON
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