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

Quick assessment

Affected
Mybb MyBB
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MyBB（MyBulletinBoard）是MyBB团队的一套用PHP和MySQL开发的免费且基于Web的论坛软件。该软件具有简单易用、支持多国语言、可扩展等特点。 MyBB 1.8.32版本存在路径遍历漏洞，该漏洞源于允许经过身份验证的管理员绕过头像上传限制并执行任意代码。

CVSS 8.8 · High EPSS 0.82% · P56
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I. Basic Information for CVE-2023-53979

Vulnerability Information
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Vulnerability Title
MyBB 1.8.32 Authenticated Remote Code Execution via Chained Vulnerabilities
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
MyBB 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MyBB（MyBulletinBoard）是MyBB团队的一套用PHP和MySQL开发的免费且基于Web的论坛软件。该软件具有简单易用、支持多国语言、可扩展等特点。 MyBB 1.8.32版本存在路径遍历漏洞，该漏洞源于允许经过身份验证的管理员绕过头像上传限制并执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mybb MyBB MyBB 1.8.32 -

II. Public POCs for CVE-2023-53979

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III. Intelligence Information for CVE-2023-53979

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Same Patch Batch · Mybb · 2025-12-22 · 4 CVEs total

CVE-2023-53976 5.4 MEDIUM myBB Forums 1.8.26 Stored Cross-Site Scripting via Template Management
CVE-2023-53977 5.4 MEDIUM myBB Forums 1.8.26 Stored Cross-Site Scripting via Forum Management
CVE-2023-53978 5.4 MEDIUM myBB Forums 1.8.26 Stored Cross-Site Scripting via Forum Announcements

IV. Related Vulnerabilities

Same product: MyBB
Same vendor: Mybb
Same weakness: CWE-22

V. Comments for CVE-2023-53979

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