UpHeron
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Servers and applications

CVE-2015-8973

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.

Severity
High 8.3
Published
31 Jan 2017
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
1.6% in the next 30 daysHigher than 76% of CVEs. EPSS by FIRST, 11 Nov 2026
Weakness
Improper access control (CWE-284)
Attack
Over the network · No login needed · No user action needed
Attacker can
Read some data · Change some data · Slow it down
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
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-2015-8973
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2015-8973