CVE-2015-8973 json
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 t…
published 2017-01-31 9 y ago modified 2026-06-17 4 mo ago also EUVD-2015-8827
- cvss
- 8.3
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.6%
- EPSS 1.6% chance of exploitation in 30 days, percentile 76%
- public exploits
- 0
- none known
Summary
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.
Exploit prediction
1.63% chance of exploitation in the next 30 days, higher than 76% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 8.3 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
Classification
- Weakness
-
- CWE-284 Improper Access Control
References
-
blog.mybb.com
/2015/09/07/mybb-1-8-6-1-6-18-merge-system-1-8-6-release/
release-notes, vendor-advisory
-
securityfocus.com
/bid/94397
vdb-entry, third-party-advisory
-
openwall.com
/lists/oss-security/2016/11/18/1
mailing-list, third-party-advisory
-
openwall.com
/lists/oss-security/2016/11/10/8
mailing-list, third-party-advisory
Sources
- CVE List CVE-2015-8973
- NVD CVE-2015-8973
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.