CVE-2015-8973

high
Published 2017-01-31 · Modified 2026-05-13
CVSS v3
8.3
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
CVSS v2
7.5
VIR risk
8.3

Description

xmlhttp.php in MyBB (aka MyBulletinBoard) before 1.6.18 and 1.8.x before 1.8.6 and MyBB Merge System before 1.8.6 allows remote attackers to bypass intended access restrictions via vectors related to the forum password.

Predictions

Exploit likelihood
89%
Patch ETA

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: cve@mitre.org — https://blog.mybb.com/2015/09/07/mybb-1-8-6-1-6-18-merge-system-1-8-6-release/

Application impact

VendorProductVersionsFixed
mybbmerge_system{"endIncluding":"1.8.5"}
mybbmybb{"endIncluding":"1.6.17"}
mybbmybb1.8.0
mybbmybb1.8.1
mybbmybb1.8.2
mybbmybb1.8.3
mybbmybb1.8.4
mybbmybb1.8.5

References

CWEs

CWE-284

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