CVE-2016-9420

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

MyBB (aka MyBulletinBoard) before 1.8.8 and MyBB Merge System before 1.8.8 allow remote attackers to have unspecified impact via vectors related to "loose comparison false positives."

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/2016/10/17/mybb-1-8-8-merge-system-1-8-8-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":"1.8.7"}
mybbmybb{"endIncluding":"1.8.7"}

References

CWEs

CWE-20

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