Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2023-46251— Visual editor persistent Cross-site Scripting (XSS) in MyBB

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团队的开发的一套用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存在跨站脚本漏洞，该漏洞源于在渲染 HTML 时无法正确转义输入。

CVSS 7.5 · High EPSS 0.47% · P39
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2023-46251

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Visual editor persistent Cross-site Scripting (XSS) in MyBB
Source: CVE Program / CVE List V5
Vulnerability Description
MyBB is a free and open source forum software. Custom MyCode (BBCode) for the visual editor (_SCEditor_) doesn't escape input properly when rendering HTML, resulting in a DOM-based XSS vulnerability. This weakness can be exploited by pointing a victim to a page where the visual editor is active (e.g. as a post or Private Message) and operates on a maliciously crafted MyCode message. This may occur on pages where message content is pre-filled using a GET/POST parameter, or on reply pages where a previously saved malicious message is quoted. The impact is be mitigated when: 1. the visual editor is disabled globally (_Admin CP → Configuration → Settings → Clickable Smilies and BB Code: [Clickable MyCode Editor](https://github.com/mybb/mybb/blob/mybb_1836/install/resources/settings.xml#L2087-L2094)_ is set to _Off_), or 2. the visual editor is disabled for individual user accounts (_User CP → Your Profile → Edit Options_: _Show the MyCode formatting options on the posting pages_ checkbox is not checked). MyBB 1.8.37 resolves this issue with the commit `6dcaf0b4d`. Users are advised to upgrade. Users unable to upgrade may mitigate the impact without upgrading MyBB by changing the following setting (_Admin CP → Configuration → Settings_): - _Clickable Smilies and BB Code → [Clickable MyCode Editor](https://github.com/mybb/mybb/blob/mybb_1836/install/resources/settings.xml#L2087-L2094)_: _Off_. Similarly, individual MyBB forum users are able to disable the visual editor by diabling the account option (_User CP → Your Profile → Edit Options_) _Show the MyCode formatting options on the posting pages_.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
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团队的开发的一套用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存在跨站脚本漏洞，该漏洞源于在渲染 HTML 时无法正确转义输入。
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 < 1.8.37 -

II. Public POCs for CVE-2023-46251

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 8066 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2023-46251

请登录查看更多情报信息。

Patches & Fixes for CVE-2023-46251 (1)

Vendor Advisories for CVE-2023-46251 (1)

Other References for CVE-2023-46251 (1)

IV. Related Vulnerabilities

Same product: mybb
Same vendor: mybb
Same weakness: CWE-79

V. Comments for CVE-2023-46251

Anonymous User
2026-01-15 06:09:10

Zaproxy alias impedit expedita quisquam pariatur exercitationem. Nemo rerum eveniet dolores rem quia dignissimos.

Anonymous User
2026-09-27 04:10:43

石巻で身体の悩みを相談したい方へ、予約、説明、費用、移動の条件を整理した来院準備ガイドです。 参考：https://ishimakishi-seitai.jp/

Leave a comment