MyBB up to 1.8.25 Custom Moderator Tools 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
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4.6$0-$5k0.00

Summaryinfo

A vulnerability was found in MyBB up to 1.8.25. It has been declared as problematic. The impacted element is an unknown function of the component Custom Moderator Tools. Executing a manipulation can lead to cross site scripting. This vulnerability is registered as CVE-2021-27949. It is possible to launch the attack remotely. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in MyBB up to 1.8.25 (Content Management System) and classified as problematic. This vulnerability affects some unknown processing of the component Custom Moderator Tools. 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.

The weakness was published 03/16/2021. The advisory is available at github.com. This vulnerability was named CVE-2021-27949. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

Upgrading to version 1.8.26 eliminates this vulnerability.

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Productinfo

Type

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.7

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.1
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

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: MyBB 1.8.26

Timelineinfo

03/04/2021 🔍
03/16/2021 +12 days 🔍
03/16/2021 +0 days 🔍
04/01/2021 +16 days 🔍

Sourcesinfo

Product: mybb.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2021-27949 (🔍)
GCVE (CVE): GCVE-0-2021-27949
GCVE (VulDB): GCVE-100-171310

Entryinfo

Created: 03/16/2021 11:07
Updated: 04/01/2021 20:48
Changes: 03/16/2021 11:07 (38), 04/01/2021 20:45 (5), 04/01/2021 20:48 (18)
Complete: 🔍
Cache ID: 216::103

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