How many CVEs does MyBB have?

MyBB has 177 published CVE records since 2005, including 38 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-352 (Cross-Site Request Forgery (CSRF)), CWE-94 (Improper Control of Generation of Code ('Code Injection')).

Are there public exploits for MyBB vulnerabilities?

Yes — 53 of MyBB's CVEs have a known public exploit.

How many critical MyBB vulnerabilities are there?

MyBB has 14 critical and 49 high-severity CVEs.

What is the average severity of MyBB CVEs?

The average CVSS base score across MyBB's scored CVEs is 6.3.

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177 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.

177

Total CVEs

Published

0

In CISA KEV

Exploited in the wild

53

Public exploits

PoC or exploit code

6.3

Avg CVSS

2005–2026

Overview

MyBB has 177 published CVE records since 2005, of which 0 are in CISA's Known Exploited Vulnerabilities catalog and 53 have a known public exploit. The average CVSS base score across scored CVEs is 6.3.

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 177 published CVEs.

Average CVSS: 6.3
Critical / high: 36%
Actively exploited (KEV): 0%
Public exploit available: 30%
Patch available: 33%

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.

Critical14

High49

Medium109

Low5

In CISA’s Known Exploited Vulnerabilities catalog

0

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

Public exploits

53

53 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

27

Latest MyBB CVEs

The most recently disclosed vulnerabilities affecting MyBB.

MyBB: Contact page reflected XSS
CWE-83
Critical · CVSS 9.3
EPSS 0.4%2026-08-18
MyBB: Installer database configuration RCE
CWE-94
Critical · CVSS 9.8
EPSS 0.8%2026-08-18
MyBB: ACP Recovery Codes CSRF
CWE-352
Medium · CVSS 4.6
EPSS 0.1%2026-08-18
MyBB: Mod CP report resolution missing authorization
CWE-862
Medium · CVSS 4.3
EPSS 0.2%2026-08-18
MyBB: Insufficient authorization for private calendar events
CWE-639
Medium · CVSS 5.4
EPSS 0.2%2026-08-18
MyBB: Buddy list corruption
CWE-252
Medium · CVSS 4.3
EPSS 0.3%2026-08-18
MyBB: Default CAPTCHA missing invalidation
CWE-837
Medium · CVSS 5.3
EPSS 0.4%2026-08-18
MyBB: Email User CRLF injection
CWE-93
Medium · CVSS 5.3
EPSS 0.3%2026-08-18
MyBB: Insufficient permission check for calendar event move
CWE-863
Medium · CVSS 4.3
EPSS 0.2%2026-08-18
MyBB: ACP UTF-8 Conversion CSRF
CWE-352
Medium · CVSS 4.6
EPSS 0.1%2026-08-18
MyBB: ACP Questions state CSRF
CWE-352
Low · CVSS 3.5
EPSS 0.1%2026-08-18
MyBB: Profile field type confusion XSS
CWE-79
High · CVSS 8.7
EPSS 0.3%2026-08-18

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Frequently asked questions

Common questions about MyBB vulnerabilities.

How many CVEs does MyBB have?: MyBB has 177 published CVE records since 2005, including 38 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-352 (Cross-Site Request Forgery (CSRF)), CWE-94 (Improper Control of Generation of Code ('Code Injection')).
Are there public exploits for MyBB vulnerabilities?: Yes — 53 of MyBB's CVEs have a known public exploit.
How many critical MyBB vulnerabilities are there?: MyBB has 14 critical and 49 high-severity CVEs.
What is the average severity of MyBB CVEs?: The average CVSS base score across MyBB's scored CVEs is 6.3.

References

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

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