All vulnerabilities

Servers and applications

CVE-2016-9403

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.

Severity
Critical 9.8
Published
31 Jan 2017
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
2.6% in the next 30 daysHigher than 85% of CVEs. EPSS by FIRST, 11 Nov 2026
Weakness
CWE-264
Attack
Over the network · No login needed · No user action needed
Attacker can
Read data · Change data · Take it down
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Sources
NVD

Affected software

SoftwareAffected versions
MyBBServers and applications · cpe:a:mybb:mybb
  • Every version up to 1.8.6

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2016-9403
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2016-9403