CVE-2023-53979 - CVE House
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Status published High CVE-2023-53979

MyBB 1.8.32 Authenticated Remote Code Execution via Chained Vulnerabilities

Vulnerability Description

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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • lUc1f3r11

References

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CVE-2023-53976
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Affected Vendor

Affected Software

MyBB
Vulnerable Versions:
MyBB 1.8.32

Timeline

Official Publish: December 22nd, 2025
Last Modified: March 5th, 2026
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weaknesses (CWE)

CWE-22

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application
Initial Access
T1005 Data from Local System
Collection
T1552 Unsecured Credentials
Credential Access
T1565.001 Stored Data Manipulation
Impact