vBulletin 6.x Login cross site scripting

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
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CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
3.2$0-$5k0.00

Summaryinfo

A vulnerability was found in vBulletin 6.x and classified as problematic. Affected is an unknown function of the component Login. Executing a manipulation can lead to cross site scripting. This vulnerability is registered as CVE-2026-9357. It is possible to launch the attack remotely. Furthermore, an exploit is available. 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.

Detailsinfo

A vulnerability classified as problematic was found in vBulletin 6.x. This vulnerability affects an unknown code of the component Login. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity.

This vulnerability was named CVE-2026-9357. The exploitation appears to be easy. The attack can be initiated remotely. Successful exploitation requires user interaction by the victim. Technical details are unknown but a public exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.007.

It is declared as proof-of-concept. The vendor was contacted early about this disclosure but did not respond in any way. VulDB is withholding an extended redistribution of exploit details to prevent simplified exploitation.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at CNNVD (CNNVD-202605-4917) and EUVD (EUVD-2026-31572). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.5
VulDB Meta Temp Score: 3.2

VulDB Base Score: 3.5
VulDB Temp Score: 3.2
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: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

05/23/2026 Advisory disclosed
05/23/2026 +0 days VulDB entry created
05/25/2026 +2 days VulDB entry last update

Sourcesinfo

Status: Not defined

CVE: CVE-2026-9357 (🔒)
GCVE (CVE): GCVE-0-2026-9357
GCVE (VulDB): GCVE-100-365320
EUVD: 🔒
CNNVD: CNNVD-202605-4917 - vBulletin 代码注入漏洞

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

Entryinfo

Created: 05/23/2026 11:44
Updated: 05/25/2026 16:33
Changes: 05/23/2026 11:44 (54), 05/25/2026 09:48 (1), 05/25/2026 16:33 (6)
Complete: 🔍
Submitter: chor4o
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #813052: Cross Site Scripting no fórum vBulletin 6.xx Vbulletin 6.x.x Cross Site Scripting (by chor4o)

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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