XSS in Mybb Merge System
CVE-2015-8976
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."
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.010 (62.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 62.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000
Affected products
- Mybb Merge System — versions 1.8.5
- Mybb — versions 1.8.0, 1.8.1, 1.8.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- blog.mybb.com/2015/09/07/mybb-1-8-6-1-6-18-merge-system-1-8-6-release/ (Release Notes, Vendor Advisory)
- www.securityfocus.com/bid/94397 (vdb-entry)
- www.openwall.com/lists/oss-security/2016/11/18/1 (mailing-list, Mailing List, Third Party Advisory)
- www.openwall.com/lists/oss-security/2016/11/10/8 (mailing-list, Third Party Advisory)
Frequently asked questions
- What is CVE-2015-8976?
- CVE-2015-8976 is a medium-severity vulnerability in Mybb Merge System, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2017-01-31.
- How severe is CVE-2015-8976?
- Medium severity. CVSS v3 base score is 6.1 out of 10.
- Is CVE-2015-8976 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.