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CVE-2025-48940— MyBB's upgrade component vulnerable to local file inclusion

Quick assessment

Affected
mybb mybb
Exploitation
Public or AI PoC available; prioritize validation
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 1.8.39之前版本存在路径遍历漏洞，该漏洞源于升级组件未正确验证用户输入，可能导致本地文件包含。

CVSS 7.2 · High EPSS 0.54% · P43
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I. Basic Information for CVE-2025-48940

Vulnerability Information
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Vulnerability Title
MyBB's upgrade component vulnerable to local file inclusion
Source: CVE Program / CVE List V5
Vulnerability Description
MyBB is free and open source forum software. Prior to version 1.8.39, the upgrade component does not validate user input properly, which allows attackers to perform local file inclusion (LFI) via a specially crafted parameter value. In order to exploit the vulnerability, the installer must be unlocked (no `install/lock` file present) and the upgrade script must be accessible (by re-installing the forum via access to `install/index.php`; when the forum has not yet been installed; or the attacker is authenticated as a forum administrator). MyBB 1.8.39 resolves this issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/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 1.8.39之前版本存在路径遍历漏洞，该漏洞源于升级组件未正确验证用户输入，可能导致本地文件包含。
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 < 1.8.39 -

II. Public POCs for CVE-2025-48940

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7707 chars
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2025-48940

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Vendor Advisories for CVE-2025-48940 (1)

IV. Related Vulnerabilities

Same product: mybb
Same vendor: mybb
Same weakness: CWE-22

V. Comments for CVE-2025-48940

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