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Vulnerability record · CVE-2017-17672 · published 14 December 2017

CVE-2017-17672: Vbulletin deserialization of untrusted data vulnerability

VVbulletin · Vbulletin

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.

9.8 CVSS 3.0 Critical EPSS 15% · top 3.4% CWE-502 · Deserialization of untrusted data
9.8CVSS 3.0 base score, v2 7.5
15%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 4 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://blogs.securiteam.com/index.php/archives/3573 ExploitThird Party Advisory
https://www.exploit-db.com/exploits/43362/ ExploitThird Party AdvisoryVDB Entry
https://blogs.securiteam.com/index.php/archives/3573 ExploitThird Party Advisory
https://www.exploit-db.com/exploits/43362/ ExploitThird Party AdvisoryVDB Entry

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2017-17672), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.