CVE-2016-9403

critical
Published 2017-01-31 · Modified 2026-05-13
CVSS v3
9.8
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v2
7.5
VIR risk
9.8

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.

Predictions

Exploit likelihood
97%
Patch ETA

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: cve@mitre.org — https://blog.mybb.com/2016/03/11/mybb-1-8-7-merge-system-1-8-7-release/

vendor Authored 2026-05-27

Vendor advisory: cve@mitre.org — http://www.openwall.com/lists/oss-security/2016/11/18/1

vendor Authored 2026-05-27

Vendor advisory: cve@mitre.org — http://www.openwall.com/lists/oss-security/2016/11/10/8

Application impact

VendorProductVersionsFixed
mybbmerge_system{"endIncluding":"1.8.6"}
mybbmybb{"endIncluding":"1.8.6"}

References

CWEs

CWE-264

Verify integrity in audit chain (admin only). AS-IS.