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Servers and applications

CVE-2017-17672

In vBulletin through 5.3.x, there is an unauthenticated deserialization vulnerability that leads to arbitrary file deletion and, under certain circumstances, code execution, because of unsafe usage of PHP's unserialize() in vB_Library_Template's cacheTemplates() function, which is a publicly exposed API. This is exploited with the templateidlist parameter to ajax/api/template/cacheTemplates.

Severity
Critical 9.8
Published
14 Dec 2017
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
15% in the next 30 daysHigher than 96% of CVEs. EPSS by FIRST, 11 Nov 2026
Weakness
Deserialization of untrusted data (CWE-502)
Attack
Over the network · No login needed · No user action needed
Attacker can
Read data · Change data · Take it down
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Sources
NVD

Affected software

SoftwareAffected versions
vBulletinServers and applications · cpe:a:vbulletin:vbulletin
  • Version 5.0.0-beta_11
  • Version 5.0.0-beta_28
  • From 5.0.1 up to 5.3.3

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2017-17672
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2017-17672