What’s Vulnerable › Vulnerabilities

CVE-2016-9403

• Severity: critical (CVSS 9.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-01-31 · updated 2026-06-17
• Weakness: CWE-264

Description

newreply.php in MyBB (aka MyBulletinBoard) before 1.8.7 and MyBB Merge System before 1.8.7 allows remote attackers to have unspecified impact by leveraging a missing permission check.

Affected products

• mybb Merge System: through 1.8.6
• mybb: through 1.8.6

References

• http://www.openwall.com/lists/oss-security/2016/11/10/8
• http://www.openwall.com/lists/oss-security/2016/11/18/1
• http://www.securityfocus.com/bid/94395
• https://blog.mybb.com/2016/03/11/mybb-1-8-7-merge-system-1-8-7-release/
• http://www.openwall.com/lists/oss-security/2016/11/10/8
• http://www.openwall.com/lists/oss-security/2016/11/18/1
• http://www.securityfocus.com/bid/94395
• https://blog.mybb.com/2016/03/11/mybb-1-8-7-merge-system-1-8-7-release/

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