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.
Advisories

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Fixes

Solution

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Workaround

No workaround given by the vendor.

History

Tue, 23 Dec 2025 23:00:00 +0000

Type Values Removed Values Added
First Time appeared Mybb
Mybb mybb
Vendors & Products Mybb
Mybb mybb

Mon, 22 Dec 2025 22:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Mon, 22 Dec 2025 21:45:00 +0000

Type Values Removed Values Added
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.
Title MyBB 1.8.32 Authenticated Remote Code Execution via Chained Vulnerabilities
Weaknesses CWE-22
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.6, '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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2025-12-22T22:04:08.541Z

Reserved: 2025-12-20T16:31:20.899Z

Link: CVE-2023-53979

cve-icon Vulnrichment

Updated: 2025-12-22T21:57:33.395Z

cve-icon NVD

Status : Undergoing Analysis

Published: 2025-12-22T22:16:03.540

Modified: 2025-12-23T14:51:52.650

Link: CVE-2023-53979

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-12-23T22:39:48Z

Weaknesses