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CVE-2023-53977— myBB Forums 1.8.26 Stored Cross-Site Scripting via Forum Management

Quick assessment

Affected
Mybb myBB forums
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 1.8.26版本存在跨站脚本漏洞，该漏洞源于论坛管理系统存在存储型跨站脚本问题，可能导致经过身份验证的管理员在创建新论坛时注入恶意脚本。

CVSS 5.4 · Medium EPSS 0.24% · P13
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I. Basic Information for CVE-2023-53977

Vulnerability Information
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Vulnerability Title
myBB Forums 1.8.26 Stored Cross-Site Scripting via Forum Management
Source: CVE Program / CVE List V5
Vulnerability Description
myBB Forums 1.8.26 contains a stored cross-site scripting vulnerability in the forum management system that allows authenticated administrators to inject malicious scripts when creating new forums. Attackers can exploit this vulnerability by inserting script payloads in the forum title field when adding new forums through the 'Forums and Posts' > 'Forum Management' interface, causing arbitrary JavaScript to execute when the forum listing is viewed.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
MyBB 跨站脚本漏洞
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 1.8.26版本存在跨站脚本漏洞，该漏洞源于论坛管理系统存在存储型跨站脚本问题，可能导致经过身份验证的管理员在创建新论坛时注入恶意脚本。
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 forums 1.8.26 -

II. Public POCs for CVE-2023-53977

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III. Intelligence Information for CVE-2023-53977

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News Coverage for CVE-2023-53977 (1)

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

CVE-2023-53979 8.8 HIGH MyBB 1.8.32 Authenticated Remote Code Execution via Chained Vulnerabilities
CVE-2023-53976 5.4 MEDIUM myBB Forums 1.8.26 Stored Cross-Site Scripting via Template 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 forums
Same vendor: Mybb
Same weakness: CWE-79

V. Comments for CVE-2023-53977

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