Home/CVE/MyBB is a free and open source forum software. The default list of disallowed remote hosts does not contain the `127.0.0
CVE

CVE-2024-23336

MyBB is a free and open source forum software. The default list of disallowed remote hosts does not contain the `127.0.0

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.

MEDIUM · CVSS 5 EPSS 0.00145
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-184Incomplete List of Disallowed Inputs
CWE-918Server-Side Request Forgery (SSRF)
▤

Affected Products & Versions

1
mybb< 1.8.38
▣

Scoring & Timeline

5
MEDIUM · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD01 May 2024 · 07:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

4
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://docs.mybb.com/1.8/administration/configuration-fileProduct
https://github.com/mybb/mybb/commit/d6a96019025de9149014e06b1df252e6122e5630Patch
https://github.com/mybb/mybb/security/advisories/GHSA-qfrj-65mv-h75hVendor Advisory
https://mybb.com/versions/1.8.38ProductRelease Notes
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