How many CVEs does MyBB have?

MyBB has 160 published CVE records since 2005, including 21 in the last two years.

How many MyBB CVEs are in CISA KEV?

None of MyBB's CVEs are currently listed in CISA's Known Exploited Vulnerabilities catalog.

Which MyBB products have the most CVEs?

The MyBB products with the most published CVEs are mybb, merge system, myBB forums, ban list, Forum Software.

What are the most common weakness types in MyBB CVEs?

MyBB's CVEs most often map to these CWE weakness types: CWE-79 (Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')), CWE-918 (Server-Side Request Forgery (SSRF)), CWE-22 (Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')), CWE-94 (Improper Control of Generation of Code ('Code Injection')).

Are there public exploits for MyBB vulnerabilities?

Yes — 54 of MyBB's CVEs have a known public exploit.

How many critical MyBB vulnerabilities are there?

MyBB has 12 critical and 48 high-severity CVEs.

What is the average severity of MyBB CVEs?

The average CVSS base score across MyBB's scored CVEs is 6.4.

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160 CVEs

MyBB Vulnerabilities

Name: MyBB vulnerability dataset (CVEs)
Creator: RadicalNotion.AI
License: https://creativecommons.org/licenses/by-nc/4.0/

CVE security advisories and vulnerability history for MyBB.

160

Total CVEs

Published

0

In CISA KEV

Exploited in the wild

54

Public exploits

PoC or exploit code

6.4

Avg CVSS

2005–2026

Overview

MyBB has 160 published CVE records since 2005, of which 0 are in CISA's Known Exploited Vulnerabilities catalog and 54 have a known public exploit. The average CVSS base score across scored CVEs is 6.4.

This page aggregates every publicly disclosed vulnerability (CVE) affecting MyBB products, with severity breakdowns, the most-affected products, the most common weakness types, and the latest disclosures.

Security scorecard

A quick read on MyBB's vulnerability posture, as a share of its 160 published CVEs.

Average CVSS: 6.4
Critical / high: 38%
Actively exploited (KEV): 0%
Public exploit available: 34%
Patch available: 25%

Severity and exploitation

How the CVSS severity of MyBB's CVEs breaks down, plus how many are exploited in the wild or have public exploit code.

Critical12

High48

Medium98

Low2

In CISA’s Known Exploited Vulnerabilities catalog

0

None of MyBB's CVEs are currently listed in CISA's KEV catalog.

Public exploits

54

54 of MyBB's CVEs have a known public exploit available.

Most affected products

The MyBB products with the most published CVEs. Follow any product to browse its versions and vulnerabilities.

Common weakness types

The CWE weakness categories most often found in MyBB CVEs. Follow any weakness for its full explanation.

CNAs that assign these CVEs

The CVE Numbering Authorities that publish MyBB CVE records.

Disclosure activity by year

How many MyBB CVEs were published each year.

2019

8

2020

4

2021

11

2022

5

2023

7

2024

3

2025

11

2026

10

Latest MyBB CVEs

The most recently disclosed vulnerabilities affecting MyBB.

MyBB - Privilege Escalation from Limited ACP User Management to Administrator
CWE-269
High · CVSS 8.6
EPSS 0.3%2026-06-28
MyBB Timeline Plugin 1.0 Cross-Site Scripting and CSRF
CWE-79
Medium · CVSS 6.9
EPSS 0.2%2026-05-16
MyBB Recent threads 17.0 Persistent Cross-Site Scripting
CWE-79
Medium · CVSS 5.1
EPSS 0.3%2026-04-29
MyBB Last User's Threads in Profile Plugin 1.2 Persistent XSS
CWE-79
Medium · CVSS 5.1
EPSS 0.2%2026-04-04
MyBB My Arcade Plugin 1.3 Persistent XSS via Comment
CWE-79
Medium · CVSS 5.1
EPSS 0.3%2026-04-04
MyBB Downloads Plugin 2.0.3 Persistent XSS via downloads.php
CWE-79
Medium · CVSS 5.1
EPSS 0.2%2026-04-04
MyBB Like Plugin 3.0.0 Cross-Site Scripting via User Profiles
CWE-79
Medium · CVSS 5.1
EPSS 0.2%2026-04-04
MyBB Delete Account Plugin 1.4 - Cross-Site Scripting
CWE-79
Medium · CVSS 5.1
EPSS 0.2%2026-01-23
MyBB Trending Widget Plugin 1.2 - Cross-Site Scripting
CWE-79
Medium · CVSS 5.1
EPSS 0.2%2026-01-23
MyBB Thread Redirect Plugin 0.2.1 - Cross-Site Scripting
CWE-79
Medium · CVSS 5.1
EPSS 0.3%2026-01-23
MyBB 1.8.32 Authenticated Remote Code Execution via Chained Vulnerabilities
CWE-22
High · CVSS 8.6
EPSS 0.7%2025-12-22
myBB Forums 1.8.26 Stored Cross-Site Scripting via Forum Announcements
CWE-79
Medium · CVSS 5.1
EPSS 0.2%2025-12-22

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Other vendors

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Frequently asked questions

Common questions about MyBB vulnerabilities.

How many CVEs does MyBB have?: MyBB has 160 published CVE records since 2005, including 21 in the last two years.
How many MyBB CVEs are in CISA KEV?: None of MyBB's CVEs are currently listed in CISA's Known Exploited Vulnerabilities catalog.
Which MyBB products have the most CVEs?: The MyBB products with the most published CVEs are mybb, merge system, myBB forums, ban list, Forum Software.
What are the most common weakness types in MyBB CVEs?: MyBB's CVEs most often map to these CWE weakness types: CWE-79 (Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')), CWE-918 (Server-Side Request Forgery (SSRF)), CWE-22 (Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')), CWE-94 (Improper Control of Generation of Code ('Code Injection')).
Are there public exploits for MyBB vulnerabilities?: Yes — 54 of MyBB's CVEs have a known public exploit.
How many critical MyBB vulnerabilities are there?: MyBB has 12 critical and 48 high-severity CVEs.
What is the average severity of MyBB CVEs?: The average CVSS base score across MyBB's scored CVEs is 6.4.

References

Vulnerability data is sourced from the CVE Program; severity, KEV, and exploit signals are aggregated by RadicalNotion.AI.

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