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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.56%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.0
- 9.8 CRITICALCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 2.56% probability · 85th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-264
- Affected
- mybb/merge system · mybb/mybb
- Source
- cve@mitre.org
EPSS 2.6% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.openwall.com/lists/oss-security/2016/11/10/8Mailing List, Patch, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2016/11/18/1Mailing List, Patch, Third Party Advisory
- http://www.securityfocus.com/bid/94395Third Party Advisory, VDB Entry
- https://blog.mybb.com/2016/03/11/mybb-1-8-7-merge-system-1-8-7-release/Patch, Release Notes, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2016/11/10/8Mailing List, Patch, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2016/11/18/1Mailing List, Patch, Third Party Advisory
- http://www.securityfocus.com/bid/94395Third Party Advisory, VDB Entry
- https://blog.mybb.com/2016/03/11/mybb-1-8-7-merge-system-1-8-7-release/Patch, Release Notes, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.