CVE-2023-53979 HIGH

CVE-2023-53979: MyBB 1.8.32 Authenticated Remote Code Execution via Chained Vulnerabilities

Vendor Mybb
Product MyBB
Weakness CWE-22 · Path traversal
Published December 22, 2025
Last update March 5, 2026
View on NVD All CVEs

CVSS base score

8.6/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

What the vulnerability does

01Description

MyBB 1.8.32 contains a chained vulnerability that allows authenticated administrators to bypass avatar upload restrictions and execute arbitrary code. Attackers can modify upload path settings, upload a malicious PHP-embedded image file, and execute commands through the language configuration editing interface.

Key dates

02Disclosure timeline

December 22, 2025 CVE published
March 5, 2026 Record updated