Threat Intelligence Database

vBulletin versions 5.x through 5.7.5 and 6.x through 6.2.1 contain a critical eval injection vulnerability in the vB5_Template_Runtime::runMaths() method. This flaw allows unauthenticated remote attackers to execute arbitrary PHP code by sending crafted input via the pagenav[pagenumber] parameter through the ajax/render template route. The vulnerability arises from an insufficiently restrictive regex filter that can be bypassed using phpfuck-style encoding. The CVSS 3.1 score for this vulnerability is 9.8, indicating critical severity.

A vulnerability was found in vBulletin 6.x. This impacts an unknown function of the component Login. Performing a manipulation results in cross site scripting. It is possible to initiate the attack remotely. The exploit has been made public and could be used. VulDB is withholding an extended redistribution of exploit details to prevent simplified exploitation. The vendor was contacted early about this disclosure but did not respond in any way.

vBulletin 3.8.7 is vulnerable to a denial-of-service condition via the misc.php?do=buddylist endpoint. If an authenticated user has a sufficiently large buddy list, processing the list can consume excessive memory, exhausting system resources and crashing the forum.