vBulletin 5.x through 5.7.5 and 6.x through 6.2.1 contains an eval injection vulnerability in the vB5TemplateRuntime::runMaths() method within the template runtime that allows unauthenticated remote attackers to execute arbitrary PHP code by supplying crafted input through the pagenav[pagenumber] parameter. Attackers can exploit the insufficiently restrictive regex filter by using phpfuck-style encoding with permitted characters to inject and execute arbitrary PHP code via the unauthenticated ajax/render template route without any authentication.

CVE-2026-61511 - a critical vulnerability in vBulletin that allows an unauthenticated attacker to execute arbitrary code on a remote server.

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.

vBulletin 5.5.4 through 5.6.2 allows remote command execution via crafted subWidgets data in an ajax/render/widgettabbedcontainertabpanel request. NOTE: this issue exists because of an incomplete fix for CVE-2019-16759.

vBulletin 5.x through 5.5.4 allows remote command execution via the widgetConfig[code] parameter in an ajax/render/widgetphp routestring request.

vBulletin 3.x.x and 4.2.x through 4.2.5 has an open redirect via the redirector.php url parameter.

In vBulletin before 5.3.0, remote attackers can bypass the CVE-2016-6483 patch and conduct SSRF attacks by leveraging the behavior of the PHP parseurl function, aka VBV-17037.

Multiple cross-site scripting (XSS) vulnerabilities in vBulletin 5.1.1 Alpha 9 allow remote attackers to inject arbitrary web script or HTML via (1) the PATHINFO to privatemessage/new/, (2) the folderid parameter to a private message in privatemessage/view, (3) a fragment indicator to /help, or (4) the view parameter to a topic, as demonstrated by a request to forum/anunturi-importante/rst-power/67030-rst-admin-restore.

The install/upgrade.php scripts in vBulletin 4.1 and 5 allow remote attackers to create administrative accounts via the customerid, htmldata[password], htmldata[confirmpassword], and htmldata[email] parameters, as exploited in the wild in October 2013.

SQL injection vulnerability in admincp/admincalendar.php in vBulletin 3.7.3.pl1 allows remote authenticated administrators to execute arbitrary SQL commands via the holidayinfo[recurring] parameter, a different vector than CVE-2005-3022.

Multiple SQL injection vulnerabilities in vBulletin 3.7.4 allow remote authenticated administrators to execute arbitrary SQL commands via the (1) answer parameter to admincp/verify.php, (2) extension parameter in an edit action to admincp/attachmentpermission.php, and the (3) iperm parameter to admincp/image.php.

Directory traversal vulnerability in vbseo.php in Crawlability vBSEO plugin 3.1.0 for vBulletin allows remote attackers to include and execute arbitrary local files via directory traversal sequences in the vbseourl parameter.

vBulletin 5.0.0 through 5.7.5 and 6.0.0 through 6.0.3 allows unauthenticated users to invoke protected API controllers' methods when running on PHP 8.1 or later, as demonstrated by the /api.php?method=protectedMethod pattern, as exploited in the wild in May 2025.

Certain vBulletin versions might allow attackers to execute arbitrary PHP code by abusing Template Conditionals in the template engine. By crafting template code in an alternative PHP function invocation syntax, such as the "vardump"("test") syntax, attackers can bypass security checks and execute arbitrary PHP code, as exploited in the wild in May 2025.

vBulletin before 5.6.9 PL1 allows an unauthenticated remote attacker to execute arbitrary code via a crafted HTTP request that triggers deserialization. This occurs because verifyserialized checks that a value is serialized by calling unserialize and then checking for errors. The fixed versions are 5.6.7 PL1, 5.6.8 PL1, and 5.6.9 PL1.

A cross-site scripting (XSS) vulnerability in the Admin Control Panel of vBulletin 5.7.5 and 6.0.0 allows attackers to execute arbitrary web scripts or HTML via the /login.php?do=login url parameter.

Open redirect vulnerability in forum/login.php in vBulletin 4.1.3 and earlier allows remote attackers to redirect users to arbitrary web sites and conduct phishing attacks via the url parameter in a lostpw action.

SQL injection vulnerability in announcement.php in vBulletin 4.1.10 allows remote attackers to execute arbitrary SQL commands via the announcementid parameter.

SQL injection vulnerability in index.php/ajax/api/reputation/vote in vBulletin 5.0.0 Beta 11, 5.0.0 Beta 28, and earlier allows remote authenticated users to execute arbitrary SQL commands via the nodeid parameter.

misc.php for vBulletin 3.0.6 and earlier, when "Add Template Name in HTML Comments" is enabled, allows remote attackers to execute arbitrary PHP code via nested variables in the template parameter.

SQL injection vulnerability in VBGooglemap Hotspot Edition 1.0.3, a vBulletin module, allows remote attackers to execute arbitrary SQL commands via the mapid parameter in a showdetails action to (1) vbgooglemaphse.php and (2) mapa.php.

Cross-site scripting (XSS) vulnerability in vBulletin 3.7.2 PL1 and 3.6.10 PL3, when "Show New Private Message Notification Pop-Up" is enabled, allows remote authenticated users to inject arbitrary web script or HTML via a private message subject (aka newpm[title]).

Multiple cross-site scripting (XSS) vulnerabilities in vBulletin 3.6.10 PL2 and earlier, and 3.7.2 and earlier 3.7.x versions, allow remote attackers to inject arbitrary web script or HTML via (1) the PATHINFO (PHPSELF) or (2) the do parameter, as demonstrated by requests to upload/admincp/faq.php. NOTE: this issue can be leveraged to execute arbitrary PHP code.

Cross-site scripting (XSS) vulnerability in vBulletin 3.6.10 and 3.7.1 allows remote attackers to inject arbitrary web script or HTML via unknown vectors and an "obscure method." NOTE: the vector is probably in the redirect parameter to the Admin Control Panel (admincp/index.php).

SQL injection vulnerability in faq.php in vBulletin 3.7.0 Gold allows remote attackers to execute arbitrary SQL commands via the q parameter in a search action.

Unspecified vulnerability in the MAPI in vBulletin Suite 4.1.2 through 4.1.12, Forum 4.1.2 through 4.1.12, and the MAPI plugin 1.4.3 for vBulletin 3.x has unknown impact and attack vectors.

Cross-site scripting (XSS) vulnerability in vBulletin 4.1.12 allows remote attackers to inject arbitrary web script or HTML via a long string in the subject parameter when creating a post.