CVE-2024-23336

low-risk
Published 2024-05-01

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.

Do I need to act?

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0.11% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.0/10 Medium
NETWORK / HIGH complexity

Affected Products (1)

Affected Vendors

Mybb

References (8)

Product https://docs.mybb.com/1.8/administration/configuration-file
Patch https://github.com/mybb/mybb/commit/d6a96019025de9149014e06b1df252e6122e5630
Vendor Advisory https://github.com/mybb/mybb/security/advisories/GHSA-qfrj-65mv-h75h
Product https://mybb.com/versions/1.8.38
Product https://docs.mybb.com/1.8/administration/configuration-file
Patch https://github.com/mybb/mybb/commit/d6a96019025de9149014e06b1df252e6122e5630
Vendor Advisory https://github.com/mybb/mybb/security/advisories/GHSA-qfrj-65mv-h75h
Product https://mybb.com/versions/1.8.38
21
/ 100
low-risk
Severity 16/34 · Moderate
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal