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CVE-2016-9417: MyBB before 1.8.8 lets attackers trick server into remote calls

CVE-2016-9417 · published 9 years ago

Summary

The MyBB forum software and its Merge System, versions older than 1.8.8, can be made to send requests to other sites on your behalf. This could let a malicious user make the server access internal resources or services you did not intend. Upgrade MyBB and the Merge System to version 1.8.8 or later, and consider restricting outbound traffic from the web server as an extra precaution.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software

Vendor	Product	Affected versions
mybb	merge_system	<= 1.8.7 `cpe:2.3:a:mybb:merge_system::::::::`
mybb	mybb	<= 1.8.7 `cpe:2.3:a:mybb:mybb::::::::`

Original advisory text

The fetch_remote_file function in MyBB (aka MyBulletinBoard) before 1.8.8 and MyBB Merge System before 1.8.8 allows remote attackers to conduct server-side request forgery (SSRF) attacks via unspec...

References

http://www.openwall.com/lists/oss-security/2016/11/10/8 Mailing List Patch Third Party Advisory
http://www.openwall.com/lists/oss-security/2016/11/18/1 Mailing List Patch Third Party Advisory
http://www.securityfocus.com/bid/94396 Third Party Advisory VDB Entry
https://blog.mybb.com/2016/10/17/mybb-1-8-8-merge-system-1-8-8-release/ Patch Release Notes Vendor Advisory

Fix within

Internet-facing 60 days

Internal At next upgrade

Not known to be exploited
Needs hands-on effort to exploit (estimated)
Gives an attacker partial control (estimated)

Severity

7.4 High

Exploitation

2% chance of attack within 30 days

Type

CWE-918Server-Side Request Forgery (SSRF)

Timeline

Published31 Jan 2017

Updated3 Nov 2026

First seen29 Sep 2026

Sources

CVE-2016-9417 · NVD

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