vBulletin up to 5.7.5/6.2.1 Template Runtime runMaths pagenav[pagenumber] code injection

CVSS Meta Temp Score
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CTI Interest Score
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7.0$0-$5k5.56-

Summaryinfo

A vulnerability classified as critical was found in vBulletin up to 5.7.5/6.2.1. This affects the function vB5_Template_Runtime::runMaths of the component Template Runtime. The manipulation of the argument pagenav[pagenumber] results in code injection. This vulnerability was named CVE-2026-61511. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability classified as critical has been found in vBulletin up to 5.7.5/6.2.1. Affected is the function vB5_Template_Runtime::runMaths of the component Template Runtime. The manipulation of the argument pagenav[pagenumber] with an unknown input leads to a code injection vulnerability. CWE is classifying the issue as CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

vBulletin 5.x through 5.7.5 and 6.x through 6.2.1 contains an eval injection vulnerability in the vB5_Template_Runtime::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.

The advisory is available at karmainsecurity.com. This vulnerability is traded as CVE-2026-61511 since 07/10/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059 by the MITRE ATT&CK project.

Upgrading to version 6.2.2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-2528). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • vBulletin vBulletin

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Code injection
CWE: CWE-94 / CWE-74 / CWE-707
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: vBulletin 6.2.2

Timelineinfo

07/10/2026 CVE reserved
07/27/2026 +17 days Advisory disclosed
07/27/2026 +0 days VulDB entry created
07/27/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: karmainsecurity.com
Status: Confirmed

CVE: CVE-2026-61511 (🔒)
GCVE (CVE): GCVE-0-2026-61511
GCVE (VulDB): GCVE-100-383418
CERT Bund: WID-SEC-2026-2528 - vBulletin: Schwachstelle ermöglicht Codeausführung

Entryinfo

Created: 07/27/2026 15:43
Updated: 07/27/2026 21:17
Changes: 07/27/2026 15:43 (56), 07/27/2026 21:17 (6)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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