vBulletin up to 5.1.9 decodeArguments arguments input validation

CVSS Meta Temp Score
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CTI Interest Score
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A vulnerability was found in vBulletin up to 5.1.9 (Forum Software) and classified as critical. Affected by this issue is the function vB_Api_Hook::decodeArguments of the file ajax/api/hook/decodeArguments. The manipulation of the argument arguments with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, integrity, and availability. CVE summarizes:

The vB_Api_Hook::decodeArguments method in vBulletin 5 Connect 5.1.2 through 5.1.9 allows remote attackers to conduct PHP object injection attacks and execute arbitrary PHP code via a crafted serialized object in the arguments parameter to ajax/api/hook/decodeArguments.

The weakness was shared 11/24/2015 (Website). The advisory is shared for download at exploit-db.com. This vulnerability is handled as CVE-2015-7808 since 10/11/2015. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details as well as a public exploit are known.

A public exploit has been developed by hhjj and been published before and not just after the advisory. The exploit is available at exploit-db.com. It is declared as highly functional. The vulnerability was handled as a non-public zero-day exploit for at least 19 days. During that time the estimated underground price was around $0-$5k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 21922.

The vulnerability is also documented in the vulnerability database at Exploit-DB (38629).





  • commercial

CPE 2.3info

CPE 2.2info


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

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



VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍


Class: Input validation
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Highly functional
Author: hhjj
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍


OpenVAS ID: 103171
OpenVAS Name: vBulletin PreAuth Remote Code Execution
OpenVAS File: 🔍
OpenVAS Family: 🔍

Saint ID: vbulletin_decodearguments
Saint Name: vBulletin decodeArguments serialized object vulnerability

MetaSploit ID: vbulletin_unserialize.rb
MetaSploit Name: vBulletin 5.1.2 Unserialize Code Execution
MetaSploit File: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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


Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍
TippingPoint: 🔍

McAfee IPS: 🔍
McAfee IPS Version: 🔍

Fortigate IPS: 🔍


10/11/2015 🔍
11/05/2015 +25 days 🔍
11/05/2015 +0 days 🔍
11/12/2015 +7 days 🔍
11/24/2015 +12 days 🔍
11/24/2015 +0 days 🔍
11/25/2015 +1 days 🔍
12/01/2015 +6 days 🔍
06/27/2022 +2400 days 🔍


Advisory: 134331
Status: Confirmed

CVE: CVE-2015-7808 (🔍)
Vulnerability Center: 54692 - vBulletin 5 Connect Remote Code Execution via PHP Injection, High

scip Labs: https://www.scip.ch/en/?labs.20161013


Created: 11/25/2015 09:54 AM
Updated: 06/27/2022 04:50 PM
Changes: 11/25/2015 09:54 AM (56), 05/09/2018 11:42 AM (20), 06/27/2022 04:50 PM (3)
Complete: 🔍


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