CVE-2016-9412
MyBB (aka MyBulletinBoard) before 1.8.7 and MyBB Merge System before 1.8.7 allow attackers to have unspecified impact via vectors related to low adminsid and sid entropy.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.17%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
MyBB (aka MyBulletinBoard) before 1.8.7 and MyBB Merge System before 1.8.7 allow attackers to have unspecified impact via vectors related to low adminsid and sid entropy.
- 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
- 2.17% probability · 82th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-284
- Affected
- mybb/merge system · mybb/mybb
- Source
- cve@mitre.org
EPSS 2.2% 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.