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CVE-2024-23336

Incomplete disallowed remote addresses list in MyBB

Published: May 1, 2024Updated: Jun 30, 2025 Sources: CVE List NVDCWE-184
NVD MITRE
5.0CVSSMEDIUM
EPSS Score
0.5%
Top 63.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

MyBB is a free and open source forum software. The default list of disallowed remote hosts does not contain the `127.0.0.0/8` block, which may result in a Server-Side Request Forgery (SSRF) vulnerability. The Configuration File's _Disallowed Remote Addresses_ list (`$config['disallowed_remote_addresses']`) contains the address `127.0.0.1`, but does not include the complete block `127.0.0.0/8`. MyBB 1.8.38 resolves this issue in default installations. Administrators of installed boards should update the existing configuration (`inc/config.php`) to include all addresses blocked by default. Additionally, users are advised to verify that it includes any other IPv4 addresses resolving to the server and other internal resources. Users unable to upgrade may manually add 127.0.0.0/8' to their disallowed address list.

CVSS Vector Breakdown

AV:NAC:HPR:LUI:NS:UC:LI:LA:L
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:LAvailability
Low
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Weaknesses

CWE-184CWE-918

Affected Products

mybbmybbWeb & CMS Plugins
mybboss-projectWeb & CMS Pluginsaka mybb forums

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Command and Control
Initial Access
View detailed technique mapping

References

https://github.com/mybb/mybb/security/advisories/GHSA-qfrj-65mv-h75h
github.com
https://github.com/mybb/mybb/commit/d6a96019025de9149014e06b1df252e6122e5630
github.com
https://docs.mybb.com/1.8/administration/configuration-file
docs.mybb.com
and 1 more references View all →

Timeline

Published
May 1, 2024
Last Updated
Jun 30, 2025

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