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Servers and applications

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."

Severity
Medium 6.1
Published
31 Jan 2017
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
1% in the next 30 daysHigher than 64% of CVEs. EPSS by FIRST, 11 Nov 2026
Weakness
Cross-site scripting (CWE-79)
Attack
Over the network · No login needed · Needs someone to click or open something
Attacker can
Read some data · Change some data
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Sources
NVD

Affected software

SoftwareAffected versions
MyBBServers and applications · cpe:a:mybb:mybb
  • Version 1.8.5
  • Version 1.8.4
  • Version 1.8.3
  • Version 1.8.2
All 7 release lines
  • Every version up to 1.6.17
  • Version 1.8.0
  • Version 1.8.1
  • Version 1.8.2
  • Version 1.8.3
  • Version 1.8.4
  • Version 1.8.5

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2015-8976
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2015-8976