CVE-2015-8976 json
Cross-site scripting (XSS) vulnerability in MyBB (aka MyBulletinBoard) before 1.6.18 and 1.8.x before 1.8.6 and MyBB Merge System before 1.…
published 2017-01-31 9 y ago modified 2026-06-17 4 mo ago also EUVD-2015-8830
- cvss
- 6.1
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 64%
- public exploits
- 0
- none known
Summary
Cross-site scripting (XSS) vulnerability in MyBB (aka MyBulletinBoard) before 1.6.18 and 1.8.x before 1.8.6 and MyBB Merge System before 1.8.6 might allow remote attackers to inject arbitrary web script or HTML via vectors related to "old upgrade files."
Exploit prediction
1.04% chance of exploitation in the next 30 days, higher than 64% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 6.1 | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
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
-
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-2015-8976
- NVD CVE-2015-8976
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.